1389962813 has 2 divisors, whose sum is σ = 1389962814. Its totient is φ = 1389962812.

The previous prime is 1389962809. The next prime is 1389962839. The reversal of 1389962813 is 3182699831.

1389962813 = 26362² + 26363².

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 695007769 + 694955044 = 26363^2 + 26362^2 .

It is a cyclic number.

It is not a de Polignac number, because 1389962813 - 2² = 1389962809 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1389962843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 694981406 + 694981407.

It is an arithmetic number, because the mean of its divisors is an integer number (694981407).

Almost surely, 2^1389962813 is an apocalyptic number.

1389962813 is the 26363-rd centered square number.

It is an amenable number.

1389962813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1389962813 is an equidigital number, since it uses as much as digits as its factorization.

1389962813 is an evil number, because the sum of its binary digits is even.

The product of its digits is 559872, while the sum is 50.

The square root of 1389962813 is about 37282.2050447663. The cubic root of 1389962813 is about 1116.0090774581.

The spelling of 1389962813 in words is "one billion, three hundred eighty-nine million, nine hundred sixty-two thousand, eight hundred thirteen".