1279431 has 6 divisors (see below), whose sum is σ = 1848080. Its totient is φ = 852948.

The previous prime is 1279427. The next prime is 1279457. The reversal of 1279431 is 1349721.

It is not a de Polignac number, because 1279431 - 2² = 1279427 is a prime.

It is a super-2 number, since 2×1279431² = 3273887367522, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1279395 and 1279404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1279931) 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 5 ways as a sum of consecutive naturals, for example, 71071 + ... + 71088.

2^1279431 is an apocalyptic number.

1279431 is a deficient number, since it is larger than the sum of its proper divisors (568649).

1279431 is a wasteful number, since it uses less digits than its factorization.

1279431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142165 (or 142162 counting only the distinct ones).

The product of its digits is 1512, while the sum is 27.

The square root of 1279431 is about 1131.1193570972. The cubic root of 1279431 is about 108.5606136998.

The spelling of 1279431 in words is "one million, two hundred seventy-nine thousand, four hundred thirty-one".