1340434231 has 4 divisors (see below), whose sum is σ = 1340539200. Its totient is φ = 1340329264.

The previous prime is 1340434189. The next prime is 1340434237. The reversal of 1340434231 is 1324340431.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 1340434231 - 2⁹ = 1340433719 is a prime.

It is a super-2 number, since 2×1340434231² = 3593527855273122722, 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 = 1340434196 and 1340434205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1340434237) 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, 30166 + ... + 59923.

It is an arithmetic number, because the mean of its divisors is an integer number (335134800).

Almost surely, 2^1340434231 is an apocalyptic number.

1340434231 is a deficient number, since it is larger than the sum of its proper divisors (104969).

1340434231 is an equidigital number, since it uses as much as digits as its factorization.

1340434231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104968.

The product of its (nonzero) digits is 3456, while the sum is 25.

The square root of 1340434231 is about 36611.9410984995. The cubic root of 1340434231 is about 1102.5928452275.

Adding to 1340434231 its reverse (1324340431), we get a palindrome (2664774662).

The spelling of 1340434231 in words is "one billion, three hundred forty million, four hundred thirty-four thousand, two hundred thirty-one".