391712648 has 8 divisors (see below), whose sum is σ = 734461230. Its totient is φ = 195856320.

The previous prime is 391712639. The next prime is 391712677. The reversal of 391712648 is 846217193.

It can be written as a sum of positive squares in only one way, i.e., 212634724 + 179077924 = 14582^2 + 13382^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24482033 + ... + 24482048.

Almost surely, 2^391712648 is an apocalyptic number.

It is an amenable number.

391712648 is a deficient number, since it is larger than the sum of its proper divisors (342748582).

391712648 is a wasteful number, since it uses less digits than its factorization.

391712648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48964087 (or 48964083 counting only the distinct ones).

The product of its digits is 72576, while the sum is 41.

The square root of 391712648 is about 19791.7318090156. The cubic root of 391712648 is about 731.6822702611.

The spelling of 391712648 in words is "three hundred ninety-one million, seven hundred twelve thousand, six hundred forty-eight".