31985460 has 72 divisors (see below), whose sum is σ = 104493480. Its totient is φ = 7872768.

The previous prime is 31985431. The next prime is 31985477. The reversal of 31985460 is 6458913.

31985460 is a `hidden beast` number, since 3 + 198 + 5 + 460 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 2108304 + 29877156 = 1452^2 + 5466^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4495 + ... + 9174.

Almost surely, 2^31985460 is an apocalyptic number.

31985460 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is an amenable number.

31985460 is an abundant number, since it is smaller than the sum of its proper divisors (72508020).

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

31985460 is a wasteful number, since it uses less digits than its factorization.

31985460 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13697 (or 13692 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 31985460 is about 5655.5689368975. The cubic root of 31985460 is about 317.4321180854.

The spelling of 31985460 in words is "thirty-one million, nine hundred eighty-five thousand, four hundred sixty".