1399654203979 has 2 divisors, whose sum is σ = 1399654203980. Its totient is φ = 1399654203978.

The previous prime is 1399654203967. The next prime is 1399654204009. The reversal of 1399654203979 is 9793024569931.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1399654203979 - 2¹⁵ = 1399654171211 is a prime.

It is not a weakly prime, because it can be changed into another prime (1399654203679) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 699827101989 + 699827101990.

It is an arithmetic number, because the mean of its divisors is an integer number (699827101990).

Almost surely, 2^{1399654203979} is an apocalyptic number.

1399654203979 is a deficient number, since it is larger than the sum of its proper divisors (1).

1399654203979 is an equidigital number, since it uses as much as digits as its factorization.

1399654203979 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 99202320, while the sum is 67.

The spelling of 1399654203979 in words is "one trillion, three hundred ninety-nine billion, six hundred fifty-four million, two hundred three thousand, nine hundred seventy-nine".