1391639423 has 2 divisors, whose sum is σ = 1391639424. Its totient is φ = 1391639422.

The previous prime is 1391639399. The next prime is 1391639441. The reversal of 1391639423 is 3249361931.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1391639423 - 2⁸ = 1391639167 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1391632423) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 695819711 + 695819712.

It is an arithmetic number, because the mean of its divisors is an integer number (695819712).

Almost surely, 2^1391639423 is an apocalyptic number.

1391639423 is a deficient number, since it is larger than the sum of its proper divisors (1).

1391639423 is an equidigital number, since it uses as much as digits as its factorization.

1391639423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 104976, while the sum is 41.

The square root of 1391639423 is about 37304.6836603663. The cubic root of 1391639423 is about 1116.4576170731.

The spelling of 1391639423 in words is "one billion, three hundred ninety-one million, six hundred thirty-nine thousand, four hundred twenty-three".