31603390938 has 192 divisors, whose sum is σ = 81564537600. Its totient is φ = 8838402048.

The previous prime is 31603390921. The next prime is 31603390963. The reversal of 31603390938 is 83909330613.

31603390938 is a `hidden beast` number, since 3 + 1 + 603 + 3 + 9 + 0 + 9 + 38 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 31603390893 and 31603390902.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 67672981 + ... + 67673447.

It is an arithmetic number, because the mean of its divisors is an integer number (424815300).

Almost surely, 2^31603390938 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31603390938, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40782268800).

31603390938 is an abundant number, since it is smaller than the sum of its proper divisors (49961146662).

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

31603390938 is a wasteful number, since it uses less digits than its factorization.

31603390938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 706 (or 689 counting only the distinct ones).

The product of its (nonzero) digits is 314928, while the sum is 45.

The spelling of 31603390938 in words is "thirty-one billion, six hundred three million, three hundred ninety thousand, nine hundred thirty-eight".