1340420431 has 12 divisors (see below), whose sum is σ = 1581230160. Its totient is φ = 1132746720.

The previous prime is 1340420429. The next prime is 1340420441. The reversal of 1340420431 is 1340240431.

It is not a de Polignac number, because 1340420431 - 2¹ = 1340420429 is a prime.

It is a super-2 number, since 2×1340420431² = 3593453863684451522, 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 (1340420441) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 189166 + ... + 196123.

It is an arithmetic number, because the mean of its divisors is an integer number (131769180).

Almost surely, 2^1340420431 is an apocalyptic number.

1340420431 is a deficient number, since it is larger than the sum of its proper divisors (240809729).

1340420431 is an equidigital number, since it uses as much as digits as its factorization.

1340420431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 385374 (or 385367 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 1340420431 is about 36611.7526349122. The cubic root of 1340420431 is about 1102.5890614204.

Adding to 1340420431 its reverse (1340240431), we get a palindrome (2680660862).

The spelling of 1340420431 in words is "one billion, three hundred forty million, four hundred twenty thousand, four hundred thirty-one".