31649538 has 8 divisors (see below), whose sum is σ = 63299088. Its totient is φ = 10549844.

The previous prime is 31649521. The next prime is 31649539. The reversal of 31649538 is 83594613.

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

31649538 is an admirable number.

It is a super-2 number, since 2×31649538² = 2003386511226888, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 31649496 and 31649505.

It is not an unprimeable number, because it can be changed into a prime (31649539) 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, 2637456 + ... + 2637467.

It is an arithmetic number, because the mean of its divisors is an integer number (7912386).

Almost surely, 2^31649538 is an apocalyptic number.

31649538 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

31649538 is a wasteful number, since it uses less digits than its factorization.

31649538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5274928.

The product of its digits is 77760, while the sum is 39.

The square root of 31649538 is about 5625.7922108802. The cubic root of 31649538 is about 316.3169455260.

The spelling of 31649538 in words is "thirty-one million, six hundred forty-nine thousand, five hundred thirty-eight".