31649138 has 16 divisors (see below), whose sum is σ = 50906880. Its totient is φ = 14703936.

The previous prime is 31649113. The next prime is 31649141. The reversal of 31649138 is 83194613.

It is a super-2 number, since 2×31649138² = 2003335872286088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31649098 and 31649107.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3206 + ... + 8577.

It is an arithmetic number, because the mean of its divisors is an integer number (3181680).

Almost surely, 2^31649138 is an apocalyptic number.

31649138 is a deficient number, since it is larger than the sum of its proper divisors (19257742).

31649138 is a wasteful number, since it uses less digits than its factorization.

31649138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11881.

The product of its digits is 15552, while the sum is 35.

The square root of 31649138 is about 5625.7566602191. The cubic root of 31649138 is about 316.3156129387.

The spelling of 31649138 in words is "thirty-one million, six hundred forty-nine thousand, one hundred thirty-eight".