391400452 has 24 divisors (see below), whose sum is σ = 732435480. Its totient is φ = 182361600.

The previous prime is 391400441. The next prime is 391400459. The reversal of 391400452 is 254004193.

It can be written as a sum of positive squares in 4 ways, for example, as 294259716 + 97140736 = 17154^2 + 9856^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 391400452.

It is not an unprimeable number, because it can be changed into a prime (391400459) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21627 + ... + 35362.

It is an arithmetic number, because the mean of its divisors is an integer number (30518145).

Almost surely, 2^391400452 is an apocalyptic number.

It is an amenable number.

391400452 is a deficient number, since it is larger than the sum of its proper divisors (341035028).

391400452 is a wasteful number, since it uses less digits than its factorization.

391400452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57111 (or 57109 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 28.

The square root of 391400452 is about 19783.8432060103. The cubic root of 391400452 is about 731.4878343720.

The spelling of 391400452 in words is "three hundred ninety-one million, four hundred thousand, four hundred fifty-two".