1397882813 has 2 divisors, whose sum is σ = 1397882814. Its totient is φ = 1397882812.

The previous prime is 1397882747. The next prime is 1397882821. The reversal of 1397882813 is 3182887931.

1397882813 = 26437² + 26438².

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 698967844 + 698914969 = 26438^2 + 26437^2 .

It is an emirp because it is prime and its reverse (3182887931) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1397882813 - 2²⁴ = 1381105597 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 (1397882833) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698941406 + 698941407.

It is an arithmetic number, because the mean of its divisors is an integer number (698941407).

Almost surely, 2^1397882813 is an apocalyptic number.

1397882813 is the 26438-th centered square number.

It is an amenable number.

1397882813 is a deficient number, since it is larger than the sum of its proper divisors (1).

1397882813 is an equidigital number, since it uses as much as digits as its factorization.

1397882813 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 580608, while the sum is 50.

The square root of 1397882813 is about 37388.2710619253. The cubic root of 1397882813 is about 1118.1247352675.

The spelling of 1397882813 in words is "one billion, three hundred ninety-seven million, eight hundred eighty-two thousand, eight hundred thirteen".