921916158 has 16 divisors (see below), whose sum is σ = 1847364096. Its totient is φ = 306716760.

The previous prime is 921916117. The next prime is 921916159. The reversal of 921916158 is 851619129.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921916159) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 143758 + ... + 150033.

It is an arithmetic number, because the mean of its divisors is an integer number (115460256).

Almost surely, 2^921916158 is an apocalyptic number.

921916158 is an abundant number, since it is smaller than the sum of its proper divisors (925447938).

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

921916158 is a wasteful number, since it uses less digits than its factorization.

921916158 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 294319.

The product of its digits is 38880, while the sum is 42.

The square root of 921916158 is about 30363.0722753808. The cubic root of 921916158 is about 973.2635876349.

The spelling of 921916158 in words is "nine hundred twenty-one million, nine hundred sixteen thousand, one hundred fifty-eight".