1240043431 has 8 divisors (see below), whose sum is σ = 1396412928. Its totient is φ = 1090947000.

The previous prime is 1240043423. The next prime is 1240043447. The reversal of 1240043431 is 1343400421.

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

It is not a de Polignac number, because 1240043431 - 2³ = 1240043423 is a prime.

It is a super-2 number, since 2×1240043431² = 3075415421532503522, 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 (1240043131) 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, 1817905 + ... + 1818586.

It is an arithmetic number, because the mean of its divisors is an integer number (174551616).

Almost surely, 2^1240043431 is an apocalyptic number.

1240043431 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

1240043431 is a deficient number, since it is larger than the sum of its proper divisors (156369497).

1240043431 is a wasteful number, since it uses less digits than its factorization.

1240043431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3636533.

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

The square root of 1240043431 is about 35214.2503966789. The cubic root of 1240043431 is about 1074.3496137278.

Adding to 1240043431 its reverse (1343400421), we get a palindrome (2583443852).

The spelling of 1240043431 in words is "one billion, two hundred forty million, forty-three thousand, four hundred thirty-one".