1240401423 has 4 divisors (see below), whose sum is σ = 1653868568. Its totient is φ = 826934280.

The previous prime is 1240401401. The next prime is 1240401439. The reversal of 1240401423 is 3241040421.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 1240401423 - 2⁵ = 1240401391 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1240401423.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1240401493) 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, 206733568 + ... + 206733573.

It is an arithmetic number, because the mean of its divisors is an integer number (413467142).

Almost surely, 2^1240401423 is an apocalyptic number.

1240401423 is a deficient number, since it is larger than the sum of its proper divisors (413467145).

1240401423 is an equidigital number, since it uses as much as digits as its factorization.

1240401423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 413467144.

The product of its (nonzero) digits is 768, while the sum is 21.

The square root of 1240401423 is about 35219.3330856790. Note that the first 3 decimals coincide. The cubic root of 1240401423 is about 1074.4529895591.

Adding to 1240401423 its reverse (3241040421), we get a palindrome (4481441844).

The spelling of 1240401423 in words is "one billion, two hundred forty million, four hundred one thousand, four hundred twenty-three".