391400264 has 8 divisors (see below), whose sum is σ = 733875510. Its totient is φ = 195700128.

The previous prime is 391400249. The next prime is 391400267. The reversal of 391400264 is 462004193.

It can be written as a sum of positive squares in only one way, i.e., 312936100 + 78464164 = 17690^2 + 8858^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (391400267) 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 as a sum of consecutive naturals, namely, 24462509 + ... + 24462524.

Almost surely, 2^391400264 is an apocalyptic number.

It is an amenable number.

391400264 is a deficient number, since it is larger than the sum of its proper divisors (342475246).

391400264 is a wasteful number, since it uses less digits than its factorization.

391400264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48925039 (or 48925035 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 29.

The square root of 391400264 is about 19783.8384546579. The cubic root of 391400264 is about 731.4877172543.

The spelling of 391400264 in words is "three hundred ninety-one million, four hundred thousand, two hundred sixty-four".