1240342643 has 16 divisors (see below), whose sum is σ = 1364484096. Its totient is φ = 1123684320.

The previous prime is 1240342637. The next prime is 1240342657. The reversal of 1240342643 is 3462430421.

It is not a de Polignac number, because 1240342643 - 2⁸ = 1240342387 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1240342613) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15005 + ... + 52017.

It is an arithmetic number, because the mean of its divisors is an integer number (85280256).

Almost surely, 2^1240342643 is an apocalyptic number.

1240342643 is a deficient number, since it is larger than the sum of its proper divisors (124141453).

1240342643 is a wasteful number, since it uses less digits than its factorization.

1240342643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37114.

The product of its (nonzero) digits is 13824, while the sum is 29.

The square root of 1240342643 is about 35218.4985909394. The cubic root of 1240342643 is about 1074.4360172728.

The spelling of 1240342643 in words is "one billion, two hundred forty million, three hundred forty-two thousand, six hundred forty-three".