31985018 has 16 divisors (see below), whose sum is σ = 54388320. Its totient is φ = 13985136.

The previous prime is 31985011. The next prime is 31985047. The reversal of 31985018 is 81058913.

It is not an unprimeable number, because it can be changed into a prime (31985011) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31880 + ... + 32867.

It is an arithmetic number, because the mean of its divisors is an integer number (3399270).

Almost surely, 2^31985018 is an apocalyptic number.

31985018 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

31985018 is a deficient number, since it is larger than the sum of its proper divisors (22403302).

31985018 is a wasteful number, since it uses less digits than its factorization.

31985018 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64781.

The product of its (nonzero) digits is 8640, while the sum is 35.

The square root of 31985018 is about 5655.5298602341. The cubic root of 31985018 is about 317.4306559039.

The spelling of 31985018 in words is "thirty-one million, nine hundred eighty-five thousand, eighteen".