1397126639 has 8 divisors (see below), whose sum is σ = 1471261440. Its totient is φ = 1323052056.

The previous prime is 1397126629. The next prime is 1397126641. The reversal of 1397126639 is 9366217931.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1397126639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1397126593 and 1397126602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1397126629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 37274 + ... + 64680.

It is an arithmetic number, because the mean of its divisors is an integer number (183907680).

Almost surely, 2^1397126639 is an apocalyptic number.

1397126639 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1397126639 is a deficient number, since it is larger than the sum of its proper divisors (74134801).

1397126639 is a wasteful number, since it uses less digits than its factorization.

1397126639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30109.

The product of its digits is 367416, while the sum is 47.

The square root of 1397126639 is about 37378.1572445727. The cubic root of 1397126639 is about 1117.9230852325.

The spelling of 1397126639 in words is "one billion, three hundred ninety-seven million, one hundred twenty-six thousand, six hundred thirty-nine".