921139588 has 12 divisors (see below), whose sum is σ = 1612521792. Its totient is φ = 460419080.

The previous prime is 921139573. The next prime is 921139591. The reversal of 921139588 is 885931129.

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 3 ways as a sum of consecutive naturals, for example, 23320 + ... + 48847.

It is an arithmetic number, because the mean of its divisors is an integer number (134376816).

Almost surely, 2^921139588 is an apocalyptic number.

It is an amenable number.

921139588 is a deficient number, since it is larger than the sum of its proper divisors (691382204).

921139588 is a wasteful number, since it uses less digits than its factorization.

921139588 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75362 (or 75360 counting only the distinct ones).

The product of its digits is 155520, while the sum is 46.

The square root of 921139588 is about 30350.2815143451. The cubic root of 921139588 is about 972.9902368125.

The spelling of 921139588 in words is "nine hundred twenty-one million, one hundred thirty-nine thousand, five hundred eighty-eight".