31486356 has 72 divisors (see below), whose sum is σ = 90627264. Its totient is φ = 9123840.

The previous prime is 31486349. The next prime is 31486387. The reversal of 31486356 is 65368413.

31486356 is a `hidden beast` number, since 3 + 14 + 8 + 635 + 6 = 666.

It is a super-2 number, since 2×31486356² = 1982781228317472, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 12.

It is a self number, because there is not a number n which added to its sum of digits gives 31486356.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7380 + ... + 10836.

It is an arithmetic number, because the mean of its divisors is an integer number (1258712).

Almost surely, 2^31486356 is an apocalyptic number.

31486356 is a gapful number since it is divisible by the number (36) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31486356, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45313632).

31486356 is an abundant number, since it is smaller than the sum of its proper divisors (59140908).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

31486356 is a wasteful number, since it uses less digits than its factorization.

31486356 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3501 (or 3496 counting only the distinct ones).

The product of its digits is 51840, while the sum is 36.

The square root of 31486356 is about 5611.2704443824. The cubic root of 31486356 is about 315.7723751970.

The spelling of 31486356 in words is "thirty-one million, four hundred eighty-six thousand, three hundred fifty-six".