1240442401423 has 4 divisors (see below), whose sum is σ = 1241889826320. Its totient is φ = 1238994976528.

The previous prime is 1240442401357. The next prime is 1240442401427. The reversal of 1240442401423 is 3241042440421.

It is a happy number.

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 1240442401423 - 2¹⁷ = 1240442270351 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240442401427) 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, 723711163 + ... + 723712876.

It is an arithmetic number, because the mean of its divisors is an integer number (310472456580).

Almost surely, 2^{1240442401423} is an apocalyptic number.

1240442401423 is a deficient number, since it is larger than the sum of its proper divisors (1447424897).

1240442401423 is an equidigital number, since it uses as much as digits as its factorization.

1240442401423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447424896.

The product of its (nonzero) digits is 24576, while the sum is 31.

Adding to 1240442401423 its reverse (3241042440421), we get a palindrome (4481484841844).

The spelling of 1240442401423 in words is "one trillion, two hundred forty billion, four hundred forty-two million, four hundred one thousand, four hundred twenty-three".