1240440431 has 8 divisors (see below), whose sum is σ = 1249459200. Its totient is φ = 1231449912.

The previous prime is 1240440427. The next prime is 1240440457. The reversal of 1240440431 is 1340440421.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1240440431 - 2² = 1240440427 is a prime.

It is a super-2 number, since 2×1240440431² = 3077384925718931522, 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 = 1240440397 and 1240440406.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240440731) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85406 + ... + 98868.

It is an arithmetic number, because the mean of its divisors is an integer number (156182400).

Almost surely, 2^1240440431 is an apocalyptic number.

1240440431 is a deficient number, since it is larger than the sum of its proper divisors (9018769).

1240440431 is a wasteful number, since it uses less digits than its factorization.

1240440431 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14125.

The product of its (nonzero) digits is 1536, while the sum is 23.

The square root of 1240440431 is about 35219.8868680750. The cubic root of 1240440431 is about 1074.4642525320.

Adding to 1240440431 its reverse (1340440421), we get a palindrome (2580880852).

The spelling of 1240440431 in words is "one billion, two hundred forty million, four hundred forty thousand, four hundred thirty-one".