1390656769 has 2 divisors, whose sum is σ = 1390656770. Its totient is φ = 1390656768.

The previous prime is 1390656739. The next prime is 1390656781. The reversal of 1390656769 is 9676560931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1390320369 + 336400 = 37287^2 + 580^2 .

It is a cyclic number.

It is not a de Polignac number, because 1390656769 - 2²³ = 1382268161 is a prime.

It is a super-2 number, since 2×1390656769² = 3867852498331038722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1390656739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695328384 + 695328385.

It is an arithmetic number, because the mean of its divisors is an integer number (695328385).

Almost surely, 2^1390656769 is an apocalyptic number.

It is an amenable number.

1390656769 is a deficient number, since it is larger than the sum of its proper divisors (1).

1390656769 is an equidigital number, since it uses as much as digits as its factorization.

1390656769 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1837080, while the sum is 52.

The square root of 1390656769 is about 37291.5106827278. The cubic root of 1390656769 is about 1116.1947736359.

The spelling of 1390656769 in words is "one billion, three hundred ninety million, six hundred fifty-six thousand, seven hundred sixty-nine".