390728466 has 12 divisors (see below), whose sum is σ = 846578382. Its totient is φ = 130242816.

The previous prime is 390728449. The next prime is 390728467. The reversal of 390728466 is 664827093.

It can be written as a sum of positive squares in only one way, i.e., 352350441 + 38378025 = 18771^2 + 6195^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (390728467) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 10853551 + ... + 10853586.

Almost surely, 2^390728466 is an apocalyptic number.

390728466 is an abundant number, since it is smaller than the sum of its proper divisors (455849916).

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

390728466 is a wasteful number, since it uses less digits than its factorization.

390728466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21707145 (or 21707142 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 390728466 is about 19766.8527085118. The cubic root of 390728466 is about 731.0689699584.

The spelling of 390728466 in words is "three hundred ninety million, seven hundred twenty-eight thousand, four hundred sixty-six".