1440230431 has 4 divisors (see below), whose sum is σ = 1440309312. Its totient is φ = 1440151552.

The previous prime is 1440230423. The next prime is 1440230453. The reversal of 1440230431 is 1340320441.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1340320441 = 173 ⋅7747517.

It is a cyclic number.

It is not a de Polignac number, because 1440230431 - 2³ = 1440230423 is a prime.

It is a super-2 number, since 2×1440230431² = 4148527388756891522, 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 (1440230401) 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, 3615 + ... + 53791.

It is an arithmetic number, because the mean of its divisors is an integer number (360077328).

Almost surely, 2^1440230431 is an apocalyptic number.

1440230431 is a deficient number, since it is larger than the sum of its proper divisors (78881).

1440230431 is an equidigital number, since it uses as much as digits as its factorization.

1440230431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78880.

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

The square root of 1440230431 is about 37950.3679955808. The cubic root of 1440230431 is about 1129.3034658538.

Adding to 1440230431 its reverse (1340320441), we get a palindrome (2780550872).

The spelling of 1440230431 in words is "one billion, four hundred forty million, two hundred thirty thousand, four hundred thirty-one".