1320431 has 4 divisors (see below), whose sum is σ = 1509072. Its totient is φ = 1131792.

The previous prime is 1320427. The next prime is 1320433. The reversal of 1320431 is 1340231.

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

It is a cyclic number.

It is not a de Polignac number, because 1320431 - 2² = 1320427 is a prime.

It is a super-2 number, since 2×1320431² = 3487076051522, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1320433) 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, 94310 + ... + 94323.

It is an arithmetic number, because the mean of its divisors is an integer number (377268).

2^1320431 is an apocalyptic number.

1320431 is a deficient number, since it is larger than the sum of its proper divisors (188641).

1320431 is an equidigital number, since it uses as much as digits as its factorization.

1320431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 188640.

The product of its (nonzero) digits is 72, while the sum is 14.

The square root of 1320431 is about 1149.1000826734. The cubic root of 1320431 is about 109.7080688991.

Adding to 1320431 its reverse (1340231), we get a palindrome (2660662).

The spelling of 1320431 in words is "one million, three hundred twenty thousand, four hundred thirty-one".