31458721938 has 32 divisors (see below), whose sum is σ = 72388252800. Its totient is φ = 8927880960.

The previous prime is 31458721919. The next prime is 31458721951. The reversal of 31458721938 is 83912785413.

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 15 ways as a sum of consecutive naturals, for example, 2507223 + ... + 2519738.

It is an arithmetic number, because the mean of its divisors is an integer number (2262132900).

Almost surely, 2^31458721938 is an apocalyptic number.

31458721938 is an abundant number, since it is smaller than the sum of its proper divisors (40929530862).

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

31458721938 is a wasteful number, since it uses less digits than its factorization.

31458721938 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5027122.

The product of its digits is 1451520, while the sum is 51.

The spelling of 31458721938 in words is "thirty-one billion, four hundred fifty-eight million, seven hundred twenty-one thousand, nine hundred thirty-eight".