391997676 has 24 divisors (see below), whose sum is σ = 1045327360. Its totient is φ = 111999312.

The previous prime is 391997633. The next prime is 391997677. The reversal of 391997676 is 676799193.

It is not an unprimeable number, because it can be changed into a prime (391997677) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2333236 + ... + 2333403.

Almost surely, 2^391997676 is an apocalyptic number.

It is an amenable number.

391997676 is an abundant number, since it is smaller than the sum of its proper divisors (653329684).

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

391997676 is a wasteful number, since it uses less digits than its factorization.

391997676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4666653 (or 4666651 counting only the distinct ones).

The product of its digits is 3857868, while the sum is 57.

The square root of 391997676 is about 19798.9311832735. The cubic root of 391997676 is about 731.8596957047.

The spelling of 391997676 in words is "three hundred ninety-one million, nine hundred ninety-seven thousand, six hundred seventy-six".