1240402443 has 16 divisors (see below), whose sum is σ = 1972317696. Its totient is φ = 677983680.

The previous prime is 1240402439. The next prime is 1240402459. The reversal of 1240402443 is 3442040421.

It is a happy number.

It is not a de Polignac number, because 1240402443 - 2² = 1240402439 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1240402483) 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, 1283578 + ... + 1284543.

It is an arithmetic number, because the mean of its divisors is an integer number (123269856).

Almost surely, 2^1240402443 is an apocalyptic number.

1240402443 is a deficient number, since it is larger than the sum of its proper divisors (731915253).

1240402443 is a wasteful number, since it uses less digits than its factorization.

1240402443 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2568154.

The product of its (nonzero) digits is 3072, while the sum is 24.

The square root of 1240402443 is about 35219.3475663590. The cubic root of 1240402443 is about 1074.4532840718.

Adding to 1240402443 its reverse (3442040421), we get a palindrome (4682442864).

The spelling of 1240402443 in words is "one billion, two hundred forty million, four hundred two thousand, four hundred forty-three".