1393127689 has 2 divisors, whose sum is σ = 1393127690. Its totient is φ = 1393127688.

The previous prime is 1393127657. The next prime is 1393127719. The reversal of 1393127689 is 9867213931.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1383468025 + 9659664 = 37195^2 + 3108^2 .

It is a cyclic number.

It is not a de Polignac number, because 1393127689 - 2⁵ = 1393127657 is a prime.

It is not a weakly prime, because it can be changed into another prime (1393127629) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696563844 + 696563845.

It is an arithmetic number, because the mean of its divisors is an integer number (696563845).

Almost surely, 2^1393127689 is an apocalyptic number.

It is an amenable number.

1393127689 is a deficient number, since it is larger than the sum of its proper divisors (1).

1393127689 is an equidigital number, since it uses as much as digits as its factorization.

1393127689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 489888, while the sum is 49.

The square root of 1393127689 is about 37324.6257717341. The cubic root of 1393127689 is about 1116.8554677226.

The spelling of 1393127689 in words is "one billion, three hundred ninety-three million, one hundred twenty-seven thousand, six hundred eighty-nine".