31838540 has 12 divisors (see below), whose sum is σ = 66860976. Its totient is φ = 12735408.

The previous prime is 31838503. The next prime is 31838561. The reversal of 31838540 is 4583813.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 31838497 and 31838506.

It is an unprimeable number.

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, 795944 + ... + 795983.

It is an arithmetic number, because the mean of its divisors is an integer number (5571748).

Almost surely, 2^31838540 is an apocalyptic number.

It is an amenable number.

31838540 is an abundant number, since it is smaller than the sum of its proper divisors (35022436).

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

31838540 is a wasteful number, since it uses less digits than its factorization.

31838540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1591936 (or 1591934 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 31838540 is about 5642.5650195634. The cubic root of 31838540 is about 316.9453477815.

The spelling of 31838540 in words is "thirty-one million, eight hundred thirty-eight thousand, five hundred forty".