1379406689 has 2 divisors, whose sum is σ = 1379406690. Its totient is φ = 1379406688.

The previous prime is 1379406683. The next prime is 1379406701. The reversal of 1379406689 is 9866049731.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 863889664 + 515517025 = 29392^2 + 22705^2 .

It is a cyclic number.

It is not a de Polignac number, because 1379406689 - 2²⁴ = 1362629473 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1379406689.

It is not a weakly prime, because it can be changed into another prime (1379406683) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689703344 + 689703345.

It is an arithmetic number, because the mean of its divisors is an integer number (689703345).

Almost surely, 2^1379406689 is an apocalyptic number.

It is an amenable number.

1379406689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1379406689 is an equidigital number, since it uses as much as digits as its factorization.

1379406689 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 1959552, while the sum is 53.

The square root of 1379406689 is about 37140.3646858778. The cubic root of 1379406689 is about 1113.1767043832.

The spelling of 1379406689 in words is "one billion, three hundred seventy-nine million, four hundred six thousand, six hundred eighty-nine".