390728875 has 8 divisors (see below), whose sum is σ = 487629792. Its totient is φ = 312583000.

The previous prime is 390728873. The next prime is 390728881. The reversal of 390728875 is 578827093.

It is not a de Polignac number, because 390728875 - 2¹ = 390728873 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (390728873) 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, 1562791 + ... + 1563040.

It is an arithmetic number, because the mean of its divisors is an integer number (60953724).

Almost surely, 2^390728875 is an apocalyptic number.

390728875 is a deficient number, since it is larger than the sum of its proper divisors (96900917).

390728875 is an equidigital number, since it uses as much as digits as its factorization.

390728875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3125846 (or 3125836 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 49.

The square root of 390728875 is about 19766.8630541115. The cubic root of 390728875 is about 731.0692250436.

The spelling of 390728875 in words is "three hundred ninety million, seven hundred twenty-eight thousand, eight hundred seventy-five".