1373639 has 2 divisors, whose sum is σ = 1373640. Its totient is φ = 1373638.

The previous prime is 1373627. The next prime is 1373677. The reversal of 1373639 is 9363731.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1373639 - 2²⁰ = 325063 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1373689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 686819 + 686820.

It is an arithmetic number, because the mean of its divisors is an integer number (686820).

2^1373639 is an apocalyptic number.

1373639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1373639 is an equidigital number, since it uses as much as digits as its factorization.

1373639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10206, while the sum is 32.

The square root of 1373639 is about 1172.0234639289. The cubic root of 1373639 is about 111.1623034845.

The spelling of 1373639 in words is "one million, three hundred seventy-three thousand, six hundred thirty-nine".