31385460 has 48 divisors (see below), whose sum is σ = 88704000. Its totient is φ = 8290944.

The previous prime is 31385437. The next prime is 31385461. The reversal of 31385460 is 6458313.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31385461) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4141 + ... + 8939.

It is an arithmetic number, because the mean of its divisors is an integer number (1848000).

Almost surely, 2^31385460 is an apocalyptic number.

31385460 is a gapful number since it is divisible by the number (30) 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 31385460, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44352000).

31385460 is an abundant number, since it is smaller than the sum of its proper divisors (57318540).

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

31385460 is a wasteful number, since it uses less digits than its factorization.

31385460 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4920 (or 4918 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 31385460 is about 5602.2727530887. The cubic root of 31385460 is about 315.4347235322.

The spelling of 31385460 in words is "thirty-one million, three hundred eighty-five thousand, four hundred sixty".