1390238669 has 2 divisors, whose sum is σ = 1390238670. Its totient is φ = 1390238668.

The previous prime is 1390238623. The next prime is 1390238671. The reversal of 1390238669 is 9668320931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1247149225 + 143089444 = 35315^2 + 11962^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1390238669 is a prime.

It is a super-2 number, since 2×1390238669² = 3865527113565783122, which contains 22 as substring.

Together with 1390238671, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1390231669) 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, 695119334 + 695119335.

It is an arithmetic number, because the mean of its divisors is an integer number (695119335).

Almost surely, 2^1390238669 is an apocalyptic number.

It is an amenable number.

1390238669 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390238669 is an equidigital number, since it uses as much as digits as its factorization.

1390238669 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 419904, while the sum is 47.

The square root of 1390238669 is about 37285.9044278129. The cubic root of 1390238669 is about 1116.0829013603.

The spelling of 1390238669 in words is "one billion, three hundred ninety million, two hundred thirty-eight thousand, six hundred sixty-nine".