1399615769 has 2 divisors, whose sum is σ = 1399615770. Its totient is φ = 1399615768.

The previous prime is 1399615739. The next prime is 1399615801. The reversal of 1399615769 is 9675169931.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1218847744 + 180768025 = 34912^2 + 13445^2 .

It is a cyclic number.

It is not a de Polignac number, because 1399615769 - 2¹² = 1399611673 is a prime.

It is a super-2 number, since 2×1399615769² = 3917848601666922722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1399615739) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699807884 + 699807885.

It is an arithmetic number, because the mean of its divisors is an integer number (699807885).

Almost surely, 2^1399615769 is an apocalyptic number.

It is an amenable number.

1399615769 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399615769 is an equidigital number, since it uses as much as digits as its factorization.

1399615769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2755620, while the sum is 56.

The square root of 1399615769 is about 37411.4390126870. The cubic root of 1399615769 is about 1118.5865910576.

The spelling of 1399615769 in words is "one billion, three hundred ninety-nine million, six hundred fifteen thousand, seven hundred sixty-nine".