921533988 has 48 divisors (see below), whose sum is σ = 2220755264. Its totient is φ = 297198720.

The previous prime is 921533983. The next prime is 921534001. The reversal of 921533988 is 889335129.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (921533983) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 74631 + ... + 86097.

Almost surely, 2^921533988 is an apocalyptic number.

It is an amenable number.

921533988 is an abundant number, since it is smaller than the sum of its proper divisors (1299221276).

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

921533988 is a wasteful number, since it uses less digits than its factorization.

921533988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11692 (or 11690 counting only the distinct ones).

The product of its digits is 466560, while the sum is 48.

The square root of 921533988 is about 30356.7782875588. The cubic root of 921533988 is about 973.1290838806.

It can be divided in two parts, 92153 and 3988, that added together give a triangular number (96141 = T₄₃₈).

The spelling of 921533988 in words is "nine hundred twenty-one million, five hundred thirty-three thousand, nine hundred eighty-eight".