31925138 has 8 divisors (see below), whose sum is σ = 54728832. Its totient is φ = 13682196.

The previous prime is 31925137. The next prime is 31925147. The reversal of 31925138 is 83152913.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (31925137) 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 3 ways as a sum of consecutive naturals, for example, 1140170 + ... + 1140197.

It is an arithmetic number, because the mean of its divisors is an integer number (6841104).

Almost surely, 2^31925138 is an apocalyptic number.

31925138 is a deficient number, since it is larger than the sum of its proper divisors (22803694).

31925138 is a wasteful number, since it uses less digits than its factorization.

31925138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2280376.

The product of its digits is 6480, while the sum is 32.

The square root of 31925138 is about 5650.2334465047. The cubic root of 31925138 is about 317.2324420437.

The spelling of 31925138 in words is "thirty-one million, nine hundred twenty-five thousand, one hundred thirty-eight".