821142732 has 12 divisors (see below), whose sum is σ = 1915999736. Its totient is φ = 273714240.

The previous prime is 821142731. The next prime is 821142767. The reversal of 821142732 is 237241128.

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

It is a self number, because there is not a number n which added to its sum of digits gives 821142732.

It is not an unprimeable number, because it can be changed into a prime (821142731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34214269 + ... + 34214292.

Almost surely, 2^821142732 is an apocalyptic number.

It is an amenable number.

821142732 is an abundant number, since it is smaller than the sum of its proper divisors (1094857004).

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

821142732 is a wasteful number, since it uses less digits than its factorization.

821142732 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68428568 (or 68428566 counting only the distinct ones).

The product of its digits is 5376, while the sum is 30.

The square root of 821142732 is about 28655.5881461191. The cubic root of 821142732 is about 936.4247515193.

The spelling of 821142732 in words is "eight hundred twenty-one million, one hundred forty-two thousand, seven hundred thirty-two".