1240434431 has 2 divisors, whose sum is σ = 1240434432. Its totient is φ = 1240434430.

The previous prime is 1240434407. The next prime is 1240434439. The reversal of 1240434431 is 1344340421.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1240434431 - 2²² = 1236240127 is a prime.

It is a super-2 number, since 2×1240434431² = 3077355155220587522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 1240434431.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1240434439) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 620217215 + 620217216.

It is an arithmetic number, because the mean of its divisors is an integer number (620217216).

Almost surely, 2^1240434431 is an apocalyptic number.

1240434431 is a deficient number, since it is larger than the sum of its proper divisors (1).

1240434431 is an equidigital number, since it uses as much as digits as its factorization.

1240434431 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4608, while the sum is 26.

The square root of 1240434431 is about 35219.8016888227. The cubic root of 1240434431 is about 1074.4625201377.

Adding to 1240434431 its reverse (1344340421), we get a palindrome (2584774852).

The spelling of 1240434431 in words is "one billion, two hundred forty million, four hundred thirty-four thousand, four hundred thirty-one".