1240343431 has 4 divisors (see below), whose sum is σ = 1240738000. Its totient is φ = 1239948864.

The previous prime is 1240343413. The next prime is 1240343453. The reversal of 1240343431 is 1343430421.

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 1240343431 - 2¹¹ = 1240341383 is a prime.

It is a super-2 number, since 2×1240343431² = 3076903653649703522, 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 = 1240343396 and 1240343405.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240343411) 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, 192531 + ... + 198868.

It is an arithmetic number, because the mean of its divisors is an integer number (310184500).

Almost surely, 2^1240343431 is an apocalyptic number.

1240343431 is a deficient number, since it is larger than the sum of its proper divisors (394569).

1240343431 is an equidigital number, since it uses as much as digits as its factorization.

1240343431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 394568.

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

The square root of 1240343431 is about 35218.5097782402. The cubic root of 1240343431 is about 1074.4362448055.

Adding to 1240343431 its reverse (1343430421), we get a palindrome (2583773852).

The spelling of 1240343431 in words is "one billion, two hundred forty million, three hundred forty-three thousand, four hundred thirty-one".