1320240431 has 4 divisors (see below), whose sum is σ = 1362828864. Its totient is φ = 1277652000.

The previous prime is 1320240421. The next prime is 1320240443. The reversal of 1320240431 is 1340420231.

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 1320240431 - 2¹⁸ = 1319978287 is a prime.

It is a super-2 number, since 2×1320240431² = 3486069591294131522, 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 (1320240421) 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, 21294170 + ... + 21294231.

It is an arithmetic number, because the mean of its divisors is an integer number (340707216).

Almost surely, 2^1320240431 is an apocalyptic number.

1320240431 is a deficient number, since it is larger than the sum of its proper divisors (42588433).

1320240431 is an equidigital number, since it uses as much as digits as its factorization.

1320240431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42588432.

The product of its (nonzero) digits is 576, while the sum is 20.

The square root of 1320240431 is about 36335.1129212502. The cubic root of 1320240431 is about 1097.0279083384.

Adding to 1320240431 its reverse (1340420231), we get a palindrome (2660660662).

The spelling of 1320240431 in words is "one billion, three hundred twenty million, two hundred forty thousand, four hundred thirty-one".