1397799639 has 8 divisors (see below), whose sum is σ = 2070814320. Its totient is φ = 931866408.

The previous prime is 1397799617. The next prime is 1397799643. The reversal of 1397799639 is 9369977931.

It is not a de Polignac number, because 1397799639 - 2⁵ = 1397799607 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397799659) 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 in 7 ways as a sum of consecutive naturals, for example, 25885152 + ... + 25885205.

It is an arithmetic number, because the mean of its divisors is an integer number (258851790).

Almost surely, 2^1397799639 is an apocalyptic number.

1397799639 is a deficient number, since it is larger than the sum of its proper divisors (673014681).

1397799639 is an equidigital number, since it uses as much as digits as its factorization.

1397799639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51770366 (or 51770360 counting only the distinct ones).

The product of its digits is 17360406, while the sum is 63.

The square root of 1397799639 is about 37387.1587446813. The cubic root of 1397799639 is about 1118.1025586944.

The spelling of 1397799639 in words is "one billion, three hundred ninety-seven million, seven hundred ninety-nine thousand, six hundred thirty-nine".