391288963 has 16 divisors (see below), whose sum is σ = 426888000. Its totient is φ = 356503680.

The previous prime is 391288943. The next prime is 391288973. The reversal of 391288963 is 369882193.

It is a de Polignac number, because none of the positive numbers 2^k-391288963 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (391288943) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 652938 + ... + 653536.

It is an arithmetic number, because the mean of its divisors is an integer number (26680500).

Almost surely, 2^391288963 is an apocalyptic number.

391288963 is a deficient number, since it is larger than the sum of its proper divisors (35599037).

391288963 is a wasteful number, since it uses less digits than its factorization.

391288963 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1182.

The product of its digits is 559872, while the sum is 49.

The square root of 391288963 is about 19781.0253273181. The cubic root of 391288963 is about 731.4183738903.

The spelling of 391288963 in words is "three hundred ninety-one million, two hundred eighty-eight thousand, nine hundred sixty-three".