391698055 has 16 divisors (see below), whose sum is σ = 539922240. Its totient is φ = 267224832.

The previous prime is 391698049. The next prime is 391698059. The reversal of 391698055 is 550896193.

It is a de Polignac number, because none of the positive numbers 2^k-391698055 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 391697996 and 391698014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (391698059) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21510 + ... + 35299.

It is an arithmetic number, because the mean of its divisors is an integer number (33745140).

Almost surely, 2^391698055 is an apocalyptic number.

391698055 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

391698055 is a deficient number, since it is larger than the sum of its proper divisors (148224185).

391698055 is a wasteful number, since it uses less digits than its factorization.

391698055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57018.

The product of its (nonzero) digits is 291600, while the sum is 46.

The square root of 391698055 is about 19791.3631415322. The cubic root of 391698055 is about 731.6731840325.

The spelling of 391698055 in words is "three hundred ninety-one million, six hundred ninety-eight thousand, fifty-five".