1391732399 has 2 divisors, whose sum is σ = 1391732400. Its totient is φ = 1391732398.

The previous prime is 1391732389. The next prime is 1391732401. The reversal of 1391732399 is 9932371931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1391732399 - 2⁸ = 1391732143 is a prime.

Together with 1391732401, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1391732389) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695866199 + 695866200.

It is an arithmetic number, because the mean of its divisors is an integer number (695866200).

Almost surely, 2^1391732399 is an apocalyptic number.

1391732399 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391732399 is an equidigital number, since it uses as much as digits as its factorization.

1391732399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 275562, while the sum is 47.

The square root of 1391732399 is about 37305.9298101522. The cubic root of 1391732399 is about 1116.4824801830.

The spelling of 1391732399 in words is "one billion, three hundred ninety-one million, seven hundred thirty-two thousand, three hundred ninety-nine".