821988952 has 16 divisors (see below), whose sum is σ = 1542585600. Its totient is φ = 410632800.

The previous prime is 821988941. The next prime is 821988953. The reversal of 821988952 is 259889128.

It is a self number, because there is not a number n which added to its sum of digits gives 821988952.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (821988953) 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, 35427 + ... + 53842.

It is an arithmetic number, because the mean of its divisors is an integer number (96411600).

Almost surely, 2^821988952 is an apocalyptic number.

It is an amenable number.

821988952 is a deficient number, since it is larger than the sum of its proper divisors (720596648).

821988952 is a wasteful number, since it uses less digits than its factorization.

821988952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90426 (or 90422 counting only the distinct ones).

The product of its digits is 829440, while the sum is 52.

The square root of 821988952 is about 28670.3497013901. The cubic root of 821988952 is about 936.7463153072.

The spelling of 821988952 in words is "eight hundred twenty-one million, nine hundred eighty-eight thousand, nine hundred fifty-two".