1279913 has 4 divisors (see below), whose sum is σ = 1355220. Its totient is φ = 1204608.

The previous prime is 1279907. The next prime is 1279919. The reversal of 1279913 is 3199721.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1279907) and next prime (1279919).

It can be written as a sum of positive squares in 2 ways, for example, as 683929 + 595984 = 827^2 + 772^2 .

It is a cyclic number.

It is not a de Polignac number, because 1279913 - 2⁸ = 1279657 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1279913.

It is not an unprimeable number, because it can be changed into a prime (1279919) 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 in 3 ways as a sum of consecutive naturals, for example, 37628 + ... + 37661.

It is an arithmetic number, because the mean of its divisors is an integer number (338805).

2^1279913 is an apocalyptic number.

It is an amenable number.

1279913 is a deficient number, since it is larger than the sum of its proper divisors (75307).

1279913 is an equidigital number, since it uses as much as digits as its factorization.

1279913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 75306.

The product of its digits is 3402, while the sum is 32.

The square root of 1279913 is about 1131.3324003139. The cubic root of 1279913 is about 108.5742446671.

The spelling of 1279913 in words is "one million, two hundred seventy-nine thousand, nine hundred thirteen".