1399679999 has 2 divisors, whose sum is σ = 1399680000. Its totient is φ = 1399679998.

The previous prime is 1399679987. The next prime is 1399680001. The reversal of 1399679999 is 9999769931.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1399679999 is a prime.

Together with 1399680001, 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 (1399679929) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699839999 + 699840000.

It is an arithmetic number, because the mean of its divisors is an integer number (699840000).

Almost surely, 2^1399679999 is an apocalyptic number.

1399679999 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399679999 is an equidigital number, since it uses as much as digits as its factorization.

1399679999 is an evil number, because the sum of its binary digits is even.

The product of its digits is 66961566, while the sum is 71.

The square root of 1399679999 is about 37412.2974301232. The cubic root of 1399679999 is about 1118.6037018770.

The spelling of 1399679999 in words is "one billion, three hundred ninety-nine million, six hundred seventy-nine thousand, nine hundred ninety-nine".