858978972 has 24 divisors (see below), whose sum is σ = 2226982800. Its totient is φ = 286326288.

The previous prime is 858978971. The next prime is 858978979. The reversal of 858978972 is 279879858.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (858978971) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3976647 + ... + 3976862.

It is an arithmetic number, because the mean of its divisors is an integer number (92790950).

Almost surely, 2^858978972 is an apocalyptic number.

It is an amenable number.

858978972 is an abundant number, since it is smaller than the sum of its proper divisors (1368003828).

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

858978972 is a wasteful number, since it uses less digits than its factorization.

858978972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7953522 (or 7953514 counting only the distinct ones).

The product of its digits is 20321280, while the sum is 63.

The square root of 858978972 is about 29308.3430442596. The cubic root of 858978972 is about 950.5920490506.

The spelling of 858978972 in words is "eight hundred fifty-eight million, nine hundred seventy-eight thousand, nine hundred seventy-two".