390328889 has 2 divisors, whose sum is σ = 390328890. Its totient is φ = 390328888.

The previous prime is 390328817. The next prime is 390328907. The reversal of 390328889 is 988823093.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 364237225 + 26091664 = 19085^2 + 5108^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-390328889 is a prime.

It is not a weakly prime, because it can be changed into another prime (390328489) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195164444 + 195164445.

It is an arithmetic number, because the mean of its divisors is an integer number (195164445).

Almost surely, 2^390328889 is an apocalyptic number.

It is an amenable number.

390328889 is a deficient number, since it is larger than the sum of its proper divisors (1).

390328889 is an equidigital number, since it uses as much as digits as its factorization.

390328889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 746496, while the sum is 50.

The square root of 390328889 is about 19756.7428742695. The cubic root of 390328889 is about 730.8196766463.

The spelling of 390328889 in words is "three hundred ninety million, three hundred twenty-eight thousand, eight hundred eighty-nine".