390028939 has 2 divisors, whose sum is σ = 390028940. Its totient is φ = 390028938.

The previous prime is 390028931. The next prime is 390028981. The reversal of 390028939 is 939820093.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 390028939 - 2³ = 390028931 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 390028895 and 390028904.

It is not a weakly prime, because it can be changed into another prime (390028931) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195014469 + 195014470.

It is an arithmetic number, because the mean of its divisors is an integer number (195014470).

Almost surely, 2^390028939 is an apocalyptic number.

390028939 is a deficient number, since it is larger than the sum of its proper divisors (1).

390028939 is an equidigital number, since it uses as much as digits as its factorization.

390028939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 104976, while the sum is 43.

The square root of 390028939 is about 19749.1503361537. The cubic root of 390028939 is about 730.6324281122.

The spelling of 390028939 in words is "three hundred ninety million, twenty-eight thousand, nine hundred thirty-nine".