1396681679 has 2 divisors, whose sum is σ = 1396681680. Its totient is φ = 1396681678.

The previous prime is 1396681619. The next prime is 1396681703. The reversal of 1396681679 is 9761866931.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1396681679 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1396681619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 698340839 + 698340840.

It is an arithmetic number, because the mean of its divisors is an integer number (698340840).

Almost surely, 2^1396681679 is an apocalyptic number.

1396681679 is a deficient number, since it is larger than the sum of its proper divisors (1).

1396681679 is an equidigital number, since it uses as much as digits as its factorization.

1396681679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2939328, while the sum is 56.

The square root of 1396681679 is about 37372.2046312497. The cubic root of 1396681679 is about 1117.8043930875.

The spelling of 1396681679 in words is "one billion, three hundred ninety-six million, six hundred eighty-one thousand, six hundred seventy-nine".