1279621 has 4 divisors (see below), whose sum is σ = 1462432. Its totient is φ = 1096812.

The previous prime is 1279609. The next prime is 1279627. The reversal of 1279621 is 1269721.

It is a happy number.

1279621 is an esthetic number in base 6, because in such base its adjacent digits differ by 1.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 1269721 = 53 ⋅23957.

It is a cyclic number.

It is not a de Polignac number, because 1279621 - 2⁷ = 1279493 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1279621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1279627) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 91395 + ... + 91408.

It is an arithmetic number, because the mean of its divisors is an integer number (365608).

2^1279621 is an apocalyptic number.

It is an amenable number.

1279621 is a deficient number, since it is larger than the sum of its proper divisors (182811).

1279621 is an equidigital number, since it uses as much as digits as its factorization.

1279621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 182810.

The product of its digits is 1512, while the sum is 28.

The square root of 1279621 is about 1131.2033415792. The cubic root of 1279621 is about 108.5659873114.

The spelling of 1279621 in words is "one million, two hundred seventy-nine thousand, six hundred twenty-one".