391982755 has 16 divisors (see below), whose sum is σ = 497403648. Its totient is φ = 296064000.

The previous prime is 391982741. The next prime is 391982777. The reversal of 391982755 is 557289193.

It is not a de Polignac number, because 391982755 - 2⁷ = 391982627 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 391982699 and 391982708.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24486 + ... + 37195.

It is an arithmetic number, because the mean of its divisors is an integer number (31087728).

Almost surely, 2^391982755 is an apocalyptic number.

391982755 is a deficient number, since it is larger than the sum of its proper divisors (105420893).

391982755 is a wasteful number, since it uses less digits than its factorization.

391982755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 61758.

The product of its digits is 680400, while the sum is 49.

The square root of 391982755 is about 19798.5543664178. The cubic root of 391982755 is about 731.8504097508.

The spelling of 391982755 in words is "three hundred ninety-one million, nine hundred eighty-two thousand, seven hundred fifty-five".