913021638 has 32 divisors (see below), whose sum is σ = 1848268800. Its totient is φ = 300659040.

The previous prime is 913021607. The next prime is 913021667. The reversal of 913021638 is 836120319.

It is a super-2 number, since 2×913021638² = 1667217022912406088, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 913021599 and 913021608.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168081 + ... + 173427.

It is an arithmetic number, because the mean of its divisors is an integer number (57758400).

Almost surely, 2^913021638 is an apocalyptic number.

913021638 is an abundant number, since it is smaller than the sum of its proper divisors (935247162).

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

913021638 is a wasteful number, since it uses less digits than its factorization.

913021638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5692.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 913021638 is about 30216.2479139949. The cubic root of 913021638 is about 970.1234965163.

The spelling of 913021638 in words is "nine hundred thirteen million, twenty-one thousand, six hundred thirty-eight".