391274655 has 8 divisors (see below), whose sum is σ = 626039472. Its totient is φ = 208679808.

The previous prime is 391274651. The next prime is 391274659. The reversal of 391274655 is 556472193.

It is an interprime number because it is at equal distance from previous prime (391274651) and next prime (391274659).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 391274655 - 2² = 391274651 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391274651) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13042474 + ... + 13042503.

It is an arithmetic number, because the mean of its divisors is an integer number (78254934).

Almost surely, 2^391274655 is an apocalyptic number.

391274655 is a deficient number, since it is larger than the sum of its proper divisors (234764817).

391274655 is a wasteful number, since it uses less digits than its factorization.

391274655 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26084985.

The product of its digits is 226800, while the sum is 42.

The square root of 391274655 is about 19780.6636642960. The cubic root of 391274655 is about 731.4094586873.

The spelling of 391274655 in words is "three hundred ninety-one million, two hundred seventy-four thousand, six hundred fifty-five".