391420136 has 32 divisors (see below), whose sum is σ = 773729280. Its totient is φ = 185361600.

The previous prime is 391420129. The next prime is 391420157. The reversal of 391420136 is 631024193.

It is a junction number, because it is equal to n+sod(n) for n = 391420099 and 391420108.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5135 + ... + 28446.

It is an arithmetic number, because the mean of its divisors is an integer number (24179040).

Almost surely, 2^391420136 is an apocalyptic number.

It is an amenable number.

391420136 is a deficient number, since it is larger than the sum of its proper divisors (382309144).

391420136 is a wasteful number, since it uses less digits than its factorization.

391420136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33665 (or 33661 counting only the distinct ones).

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 391420136 is about 19784.3406764036. The cubic root of 391420136 is about 731.5000966344.

The spelling of 391420136 in words is "three hundred ninety-one million, four hundred twenty thousand, one hundred thirty-six".