31985480 has 16 divisors (see below), whose sum is σ = 71967420. Its totient is φ = 12794176.

The previous prime is 31985477. The next prime is 31985489. The reversal of 31985480 is 8458913.

It can be written as a sum of positive squares in 2 ways, for example, as 30891364 + 1094116 = 5558^2 + 1046^2 .

It is not an unprimeable number, because it can be changed into a prime (31985489) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 399779 + ... + 399858.

Almost surely, 2^31985480 is an apocalyptic number.

It is an amenable number.

31985480 is an abundant number, since it is smaller than the sum of its proper divisors (39981940).

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

31985480 is a wasteful number, since it uses less digits than its factorization.

31985480 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 799648 (or 799644 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 31985480 is about 5655.5707050659. The cubic root of 31985480 is about 317.4321842471.

The spelling of 31985480 in words is "thirty-one million, nine hundred eighty-five thousand, four hundred eighty".