921720932 has 24 divisors (see below), whose sum is σ = 1852263840. Its totient is φ = 396912960.

The previous prime is 921720911. The next prime is 921720937. The reversal of 921720932 is 239027129.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 921720892 and 921720901.

It is not an unprimeable number, because it can be changed into a prime (921720937) 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, 550433 + ... + 552104.

It is an arithmetic number, because the mean of its divisors is an integer number (77177660).

Almost surely, 2^921720932 is an apocalyptic number.

It is an amenable number.

921720932 is an abundant number, since it is smaller than the sum of its proper divisors (930542908).

921720932 is a wasteful number, since it uses less digits than its factorization.

921720932 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102571 (or 1102569 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 35.

The square root of 921720932 is about 30359.8572460412. The cubic root of 921720932 is about 973.1948829886.

The spelling of 921720932 in words is "nine hundred twenty-one million, seven hundred twenty thousand, nine hundred thirty-two".