31493286 has 96 divisors (see below), whose sum is σ = 79567488. Its totient is φ = 9253440.

The previous prime is 31493251. The next prime is 31493291. The reversal of 31493286 is 68239413.

It is a self number, because there is not a number n which added to its sum of digits gives 31493286.

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 47 ways as a sum of consecutive naturals, for example, 229810 + ... + 229946.

It is an arithmetic number, because the mean of its divisors is an integer number (828828).

Almost surely, 2^31493286 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31493286, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39783744).

31493286 is an abundant number, since it is smaller than the sum of its proper divisors (48074202).

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

31493286 is a wasteful number, since it uses less digits than its factorization.

31493286 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 208 (or 196 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 31493286 is about 5611.8879176263. The cubic root of 31493286 is about 315.7955401729.

The spelling of 31493286 in words is "thirty-one million, four hundred ninety-three thousand, two hundred eighty-six".