921898992 has 40 divisors (see below), whose sum is σ = 2721798016. Its totient is φ = 263399616.

The previous prime is 921898877. The next prime is 921898997. The reversal of 921898992 is 299898129.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (921898997) 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, 1371538 + ... + 1372209.

Almost surely, 2^921898992 is an apocalyptic number.

It is an amenable number.

921898992 is an abundant number, since it is smaller than the sum of its proper divisors (1799899024).

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

921898992 is a wasteful number, since it uses less digits than its factorization.

921898992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2743765 (or 2743759 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 57.

The square root of 921898992 is about 30362.7895951607. The cubic root of 921898992 is about 973.2575469025.

The spelling of 921898992 in words is "nine hundred twenty-one million, eight hundred ninety-eight thousand, nine hundred ninety-two".