1379639 has 2 divisors, whose sum is σ = 1379640. Its totient is φ = 1379638.

The previous prime is 1379633. The next prime is 1379641. The reversal of 1379639 is 9369731.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1379639 - 2⁸ = 1379383 is a prime.

Together with 1379641, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1379633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 689819 + 689820.

It is an arithmetic number, because the mean of its divisors is an integer number (689820).

2^1379639 is an apocalyptic number.

1379639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1379639 is an equidigital number, since it uses as much as digits as its factorization.

1379639 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 30618, while the sum is 38.

The square root of 1379639 is about 1174.5803505934. The cubic root of 1379639 is about 111.3239192282.

The spelling of 1379639 in words is "one million, three hundred seventy-nine thousand, six hundred thirty-nine".