391866964 has 12 divisors (see below), whose sum is σ = 688614388. Its totient is φ = 195120000.

The previous prime is 391866941. The next prime is 391866997. The reversal of 391866964 is 469668193.

It can be written as a sum of positive squares in 2 ways, for example, as 314778564 + 77088400 = 17742^2 + 8780^2 .

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, 202287 + ... + 204214.

Almost surely, 2^391866964 is an apocalyptic number.

It is an amenable number.

391866964 is a deficient number, since it is larger than the sum of its proper divisors (296747424).

391866964 is a wasteful number, since it uses less digits than its factorization.

391866964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406746 (or 406744 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 52.

The square root of 391866964 is about 19795.6299217782. The cubic root of 391866964 is about 731.7783402228.

The spelling of 391866964 in words is "three hundred ninety-one million, eight hundred sixty-six thousand, nine hundred sixty-four".