390005969 has 2 divisors, whose sum is σ = 390005970. Its totient is φ = 390005968.

The previous prime is 390005933. The next prime is 390005999. The reversal of 390005969 is 969500093.

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., 364351744 + 25654225 = 19088^2 + 5065^2 .

It is a cyclic number.

It is not a de Polignac number, because 390005969 - 2⁸ = 390005713 is a prime.

It is a super-2 number, since 2×390005969² = 304209311711257922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (390005999) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195002984 + 195002985.

It is an arithmetic number, because the mean of its divisors is an integer number (195002985).

Almost surely, 2^390005969 is an apocalyptic number.

It is an amenable number.

390005969 is a deficient number, since it is larger than the sum of its proper divisors (1).

390005969 is an equidigital number, since it uses as much as digits as its factorization.

390005969 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 65610, while the sum is 41.

The square root of 390005969 is about 19748.5687835853. The cubic root of 390005969 is about 730.6180847694.

The spelling of 390005969 in words is "three hundred ninety million, five thousand, nine hundred sixty-nine".