31138458 has 64 divisors (see below), whose sum is σ = 74172672. Its totient is φ = 8616960.

The previous prime is 31138447. The next prime is 31138517. The reversal of 31138458 is 85483113.

It is a Curzon number.

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 31 ways as a sum of consecutive naturals, for example, 29988 + ... + 31008.

It is an arithmetic number, because the mean of its divisors is an integer number (1158948).

Almost surely, 2^31138458 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 31138458, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37086336).

31138458 is an abundant number, since it is smaller than the sum of its proper divisors (43034214).

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

31138458 is a wasteful number, since it uses less digits than its factorization.

31138458 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1079.

The product of its digits is 11520, while the sum is 33.

The square root of 31138458 is about 5580.1844055551. The cubic root of 31138458 is about 314.6050580711.

The spelling of 31138458 in words is "thirty-one million, one hundred thirty-eight thousand, four hundred fifty-eight".