390781055 has 16 divisors (see below), whose sum is σ = 536639040. Its totient is φ = 267608832.

The previous prime is 390781043. The next prime is 390781081. The reversal of 390781055 is 550187093.

It is a cyclic number.

It is not a de Polignac number, because 390781055 - 2¹⁶ = 390715519 is a prime.

It is a congruent number.

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, 20891 + ... + 34899.

It is an arithmetic number, because the mean of its divisors is an integer number (33539940).

Almost surely, 2^390781055 is an apocalyptic number.

390781055 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

390781055 is a deficient number, since it is larger than the sum of its proper divisors (145857985).

390781055 is a wasteful number, since it uses less digits than its factorization.

390781055 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14818.

The product of its (nonzero) digits is 37800, while the sum is 38.

The square root of 390781055 is about 19768.1828957545. The cubic root of 390781055 is about 731.1017672117.

The spelling of 390781055 in words is "three hundred ninety million, seven hundred eighty-one thousand, fifty-five".