839999972 has 12 divisors (see below), whose sum is σ = 1680000000. Its totient is φ = 359999976.

The previous prime is 839999959. The next prime is 839999981. The reversal of 839999972 is 279999938.

839999972 is an admirable number.

It is a junction number, because it is equal to n+sod(n) for n = 839999899 and 839999908.

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, 14999972 + ... + 15000027.

It is an arithmetic number, because the mean of its divisors is an integer number (140000000).

Almost surely, 2^839999972 is an apocalyptic number.

It is an amenable number.

839999972 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

839999972 is a wasteful number, since it uses less digits than its factorization.

839999972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30000010 (or 30000008 counting only the distinct ones).

The product of its digits is 19840464, while the sum is 65.

The square root of 839999972 is about 28982.7530093330. The cubic root of 839999972 is about 943.5387855795.

The spelling of 839999972 in words is "eight hundred thirty-nine million, nine hundred ninety-nine thousand, nine hundred seventy-two".