1297431 has 16 divisors (see below), whose sum is σ = 1989600. Its totient is φ = 834624.

The previous prime is 1297421. The next prime is 1297447. The reversal of 1297431 is 1347921.

It is not a de Polignac number, because 1297431 - 2⁵ = 1297399 is a prime.

It is a super-2 number, since 2×1297431² = 3366654399522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a junction number, because it is equal to n+sod(n) for n = 1297395 and 1297404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1297411) 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 15 ways as a sum of consecutive naturals, for example, 46 + ... + 1611.

It is an arithmetic number, because the mean of its divisors is an integer number (124350).

2^1297431 is an apocalyptic number.

1297431 is a deficient number, since it is larger than the sum of its proper divisors (692169).

1297431 is a wasteful number, since it uses less digits than its factorization.

1297431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1695 (or 1689 counting only the distinct ones).

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

The square root of 1297431 is about 1139.0482869484. The cubic root of 1297431 is about 109.0673488894.

It can be divided in two parts, 1297 and 431, that added together give a cube (1728 = 12³).

The spelling of 1297431 in words is "one million, two hundred ninety-seven thousand, four hundred thirty-one".