1393739279 has 2 divisors, whose sum is σ = 1393739280. Its totient is φ = 1393739278.

The previous prime is 1393739267. The next prime is 1393739297. The reversal of 1393739279 is 9729373931.

Together with next prime (1393739297) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1393739279 - 2⁸ = 1393739023 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1393739279.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1393739209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 696869639 + 696869640.

It is an arithmetic number, because the mean of its divisors is an integer number (696869640).

Almost surely, 2^1393739279 is an apocalyptic number.

1393739279 is a deficient number, since it is larger than the sum of its proper divisors (1).

1393739279 is an equidigital number, since it uses as much as digits as its factorization.

1393739279 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1928934, while the sum is 53.

The square root of 1393739279 is about 37332.8177211418. The cubic root of 1393739279 is about 1117.0188788514.

The spelling of 1393739279 in words is "one billion, three hundred ninety-three million, seven hundred thirty-nine thousand, two hundred seventy-nine".