391898368 has 18 divisors (see below), whose sum is σ = 782266394. Its totient is φ = 195949056.

The previous prime is 391898363. The next prime is 391898369. The reversal of 391898368 is 863898193.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 234947584 + 156950784 = 15328^2 + 12528^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391898363) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 765171 + ... + 765682.

Almost surely, 2^391898368 is an apocalyptic number.

It is an amenable number.

391898368 is a deficient number, since it is larger than the sum of its proper divisors (390368026).

391898368 is an equidigital number, since it uses as much as digits as its factorization.

391898368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1530869 (or 1530855 counting only the distinct ones).

The product of its digits is 2239488, while the sum is 55.

The square root of 391898368 is about 19796.4231112593. The cubic root of 391898368 is about 731.7978878034.

The spelling of 391898368 in words is "three hundred ninety-one million, eight hundred ninety-eight thousand, three hundred sixty-eight".