391306964 has 6 divisors (see below), whose sum is σ = 684787194. Its totient is φ = 195653480.

The previous prime is 391306963. The next prime is 391306967. The reversal of 391306964 is 469603193.

It can be written as a sum of positive squares in only one way, i.e., 391248400 + 58564 = 19780^2 + 242^2 .

It is a super-2 number, since 2×391306964² = 306242280149794592, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391306963) 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 as a sum of consecutive naturals, namely, 48913367 + ... + 48913374.

It is an arithmetic number, because the mean of its divisors is an integer number (114131199).

Almost surely, 2^391306964 is an apocalyptic number.

It is an amenable number.

391306964 is a deficient number, since it is larger than the sum of its proper divisors (293480230).

391306964 is a wasteful number, since it uses less digits than its factorization.

391306964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97826745 (or 97826743 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 41.

The square root of 391306964 is about 19781.4803288328. The cubic root of 391306964 is about 731.4295898641.

The spelling of 391306964 in words is "three hundred ninety-one million, three hundred six thousand, nine hundred sixty-four".