391608140 has 48 divisors (see below), whose sum is σ = 1025305344. Its totient is φ = 122059200.

The previous prime is 391608127. The next prime is 391608187. The reversal of 391608140 is 41806193.

391608140 = 6993² + 6994² + ... + 7000².

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 391608097 and 391608106.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 125606 + ... + 128685.

It is an arithmetic number, because the mean of its divisors is an integer number (21360528).

Almost surely, 2^391608140 is an apocalyptic number.

It is an amenable number.

391608140 is an abundant number, since it is smaller than the sum of its proper divisors (633697204).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

391608140 is a wasteful number, since it uses less digits than its factorization.

391608140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 254318 (or 254316 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 32.

The square root of 391608140 is about 19789.0914394775. The cubic root of 391608140 is about 731.6171941119.

The spelling of 391608140 in words is "three hundred ninety-one million, six hundred eight thousand, one hundred forty".