390764505 has 8 divisors (see below), whose sum is σ = 625223232. Its totient is φ = 208407728.

The previous prime is 390764489. The next prime is 390764513. The reversal of 390764505 is 505467093.

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

It is a cyclic number.

It is not a de Polignac number, because 390764505 - 2⁴ = 390764489 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 13025469 + ... + 13025498.

It is an arithmetic number, because the mean of its divisors is an integer number (78152904).

Almost surely, 2^390764505 is an apocalyptic number.

It is an amenable number.

390764505 is a deficient number, since it is larger than the sum of its proper divisors (234458727).

390764505 is a wasteful number, since it uses less digits than its factorization.

390764505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26050975.

The product of its (nonzero) digits is 113400, while the sum is 39.

The square root of 390764505 is about 19767.7642893677. The cubic root of 390764505 is about 731.0914460827.

The spelling of 390764505 in words is "three hundred ninety million, seven hundred sixty-four thousand, five hundred five".