1270639 has 2 divisors, whose sum is σ = 1270640. Its totient is φ = 1270638.

The previous prime is 1270627. The next prime is 1270649. The reversal of 1270639 is 9360721.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1270639 is a prime.

It is a super-2 number, since 2×1270639² = 3229046936642, which contains 22 as substring.

It is a Chen prime.

1270639 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1270609) 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, 635319 + 635320.

It is an arithmetic number, because the mean of its divisors is an integer number (635320).

2^1270639 is an apocalyptic number.

1270639 is a deficient number, since it is larger than the sum of its proper divisors (1).

1270639 is an equidigital number, since it uses as much as digits as its factorization.

1270639 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2268, while the sum is 28.

The square root of 1270639 is about 1127.2262417102. The cubic root of 1270639 is about 108.3113728004.

The spelling of 1270639 in words is "one million, two hundred seventy thousand, six hundred thirty-nine".