390290305 has 16 divisors (see below), whose sum is σ = 497534400. Its totient is φ = 293077440.

The previous prime is 390290291. The next prime is 390290333. The reversal of 390290305 is 503092093.

It is not a de Polignac number, because 390290305 - 2⁵ = 390290273 is a prime.

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, 8491 + ... + 29200.

It is an arithmetic number, because the mean of its divisors is an integer number (31095900).

Almost surely, 2^390290305 is an apocalyptic number.

It is an amenable number.

390290305 is a deficient number, since it is larger than the sum of its proper divisors (107244095).

390290305 is a wasteful number, since it uses less digits than its factorization.

390290305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37824.

The product of its (nonzero) digits is 7290, while the sum is 31.

The square root of 390290305 is about 19755.7663733908. The cubic root of 390290305 is about 730.7955953511.

The spelling of 390290305 in words is "three hundred ninety million, two hundred ninety thousand, three hundred five".