391649596 has 24 divisors (see below), whose sum is σ = 739571504. Its totient is φ = 180403200.

The previous prime is 391649591. The next prime is 391649653. The reversal of 391649596 is 695946193.

It is a Harshad number since it is a multiple of its sum of digits (52).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391649591) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 19996 + ... + 34396.

Almost surely, 2^391649596 is an apocalyptic number.

It is an amenable number.

391649596 is a deficient number, since it is larger than the sum of its proper divisors (347921908).

391649596 is a wasteful number, since it uses less digits than its factorization.

391649596 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14941 (or 14939 counting only the distinct ones).

The product of its digits is 1574640, while the sum is 52.

The square root of 391649596 is about 19790.1388575219. The cubic root of 391649596 is about 731.6430097587.

The spelling of 391649596 in words is "three hundred ninety-one million, six hundred forty-nine thousand, five hundred ninety-six".