820985972 has 12 divisors (see below), whose sum is σ = 1512342720. Its totient is φ = 388888056.

The previous prime is 820985941. The next prime is 820986011. The reversal of 820985972 is 279589028.

It is a self number, because there is not a number n which added to its sum of digits gives 820985972.

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, 5401148 + ... + 5401299.

It is an arithmetic number, because the mean of its divisors is an integer number (126028560).

Almost surely, 2^820985972 is an apocalyptic number.

It is an amenable number.

820985972 is a deficient number, since it is larger than the sum of its proper divisors (691356748).

820985972 is a wasteful number, since it uses less digits than its factorization.

820985972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10802470 (or 10802468 counting only the distinct ones).

The product of its (nonzero) digits is 725760, while the sum is 50.

The square root of 820985972 is about 28652.8527724553. The cubic root of 820985972 is about 936.3651584342.

The spelling of 820985972 in words is "eight hundred twenty million, nine hundred eighty-five thousand, nine hundred seventy-two".