1021572732 has 12 divisors (see below), whose sum is σ = 2383669736. Its totient is φ = 340524240.

The previous prime is 1021572697. The next prime is 1021572749. The reversal of 1021572732 is 2372751201.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×1021572732² = 2087221693531887648, which contains 22 as substring.

It is a hoax number, since the sum of its digits (30) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 1021572732.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 42565519 + ... + 42565542.

Almost surely, 2^1021572732 is an apocalyptic number.

1021572732 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1021572732 is an abundant number, since it is smaller than the sum of its proper divisors (1362097004).

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

1021572732 is a wasteful number, since it uses less digits than its factorization.

1021572732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 85131068 (or 85131066 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 30.

The square root of 1021572732 is about 31962.0514360390. The cubic root of 1021572732 is about 1007.1398124233.

The spelling of 1021572732 in words is "one billion, twenty-one million, five hundred seventy-two thousand, seven hundred thirty-two".