390138569 has 2 divisors, whose sum is σ = 390138570. Its totient is φ = 390138568.

The previous prime is 390138523. The next prime is 390138601. The reversal of 390138569 is 965831093.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 197262025 + 192876544 = 14045^2 + 13888^2 .

It is a cyclic number.

It is not a de Polignac number, because 390138569 - 2⁸ = 390138313 is a prime.

It is a super-2 number, since 2×390138569² = 304416206042735522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (390132569) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 195069284 + 195069285.

It is an arithmetic number, because the mean of its divisors is an integer number (195069285).

Almost surely, 2^390138569 is an apocalyptic number.

It is an amenable number.

390138569 is a deficient number, since it is larger than the sum of its proper divisors (1).

390138569 is an equidigital number, since it uses as much as digits as its factorization.

390138569 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 44.

The square root of 390138569 is about 19751.9257035865. The cubic root of 390138569 is about 730.7008775027.

The spelling of 390138569 in words is "three hundred ninety million, one hundred thirty-eight thousand, five hundred sixty-nine".