1389658769 has 2 divisors, whose sum is σ = 1389658770. Its totient is φ = 1389658768.

The previous prime is 1389658759. The next prime is 1389658811. The reversal of 1389658769 is 9678569831.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 870958144 + 518700625 = 29512^2 + 22775^2 .

It is a cyclic number.

It is not a de Polignac number, because 1389658769 - 2²⁴ = 1372881553 is a prime.

It is a super-2 number, since 2×1389658769² = 3862302988517190722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (1389658709) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694829384 + 694829385.

It is an arithmetic number, because the mean of its divisors is an integer number (694829385).

Almost surely, 2^1389658769 is an apocalyptic number.

It is an amenable number.

1389658769 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389658769 is an equidigital number, since it uses as much as digits as its factorization.

1389658769 is an evil number, because the sum of its binary digits is even.

The product of its digits is 19595520, while the sum is 62.

The square root of 1389658769 is about 37278.1272195908. The cubic root of 1389658769 is about 1115.9276986364.

The spelling of 1389658769 in words is "one billion, three hundred eighty-nine million, six hundred fifty-eight thousand, seven hundred sixty-nine".