391587964 has 6 divisors (see below), whose sum is σ = 685278944. Its totient is φ = 195793980.

The previous prime is 391587961. The next prime is 391587991. The reversal of 391587964 is 469785193.

It is a happy number.

It is a super-2 number, since 2×391587964² = 306682267099330592, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391587961) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48948492 + ... + 48948499.

Almost surely, 2^391587964 is an apocalyptic number.

It is an amenable number.

391587964 is a deficient number, since it is larger than the sum of its proper divisors (293690980).

391587964 is a wasteful number, since it uses less digits than its factorization.

391587964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 97896995 (or 97896993 counting only the distinct ones).

The product of its digits is 1632960, while the sum is 52.

The square root of 391587964 is about 19788.5816571072. The cubic root of 391587964 is about 731.6046293731.

The spelling of 391587964 in words is "three hundred ninety-one million, five hundred eighty-seven thousand, nine hundred sixty-four".