390266778 has 16 divisors (see below), whose sum is σ = 851491296. Its totient is φ = 118262640.

The previous prime is 390266777. The next prime is 390266801. The reversal of 390266778 is 877662093.

It is not an unprimeable number, because it can be changed into a prime (390266777) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2956501 + ... + 2956632.

It is an arithmetic number, because the mean of its divisors is an integer number (53218206).

Almost surely, 2^390266778 is an apocalyptic number.

390266778 is an abundant number, since it is smaller than the sum of its proper divisors (461224518).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

390266778 is a wasteful number, since it uses less digits than its factorization.

390266778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5913149.

The product of its (nonzero) digits is 762048, while the sum is 48.

The square root of 390266778 is about 19755.1709180154. The cubic root of 390266778 is about 730.7809107490.

The spelling of 390266778 in words is "three hundred ninety million, two hundred sixty-six thousand, seven hundred seventy-eight".