390289155 has 16 divisors (see below), whose sum is σ = 626240160. Its totient is φ = 207561728.

The previous prime is 390289153. The next prime is 390289169. The reversal of 390289155 is 551982093.

It is a cyclic number.

It is not a de Polignac number, because 390289155 - 2¹ = 390289153 is a prime.

It is a super-2 number, since 2×390289155² = 304651249021228050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (390289153) 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, 31560 + ... + 42149.

It is an arithmetic number, because the mean of its divisors is an integer number (39140010).

Almost surely, 2^390289155 is an apocalyptic number.

390289155 is a deficient number, since it is larger than the sum of its proper divisors (235951005).

390289155 is a wasteful number, since it uses less digits than its factorization.

390289155 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 74070.

The product of its (nonzero) digits is 97200, while the sum is 42.

The square root of 390289155 is about 19755.7372679432. The cubic root of 390289155 is about 730.7948775813.

The spelling of 390289155 in words is "three hundred ninety million, two hundred eighty-nine thousand, one hundred fifty-five".