402440312423 has 2 divisors, whose sum is σ = 402440312424. Its totient is φ = 402440312422.

The previous prime is 402440312399. The next prime is 402440312507. The reversal of 402440312423 is 324213044204.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402440312423 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (402440312023) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 201220156211 + 201220156212.

It is an arithmetic number, because the mean of its divisors is an integer number (201220156212).

Almost surely, 2^402440312423 is an apocalyptic number.

402440312423 is a deficient number, since it is larger than the sum of its proper divisors (1).

402440312423 is an equidigital number, since it uses as much as digits as its factorization.

402440312423 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 18432, while the sum is 29.

Adding to 402440312423 its reverse (324213044204), we get a palindrome (726653356627).

The spelling of 402440312423 in words is "four hundred two billion, four hundred forty million, three hundred twelve thousand, four hundred twenty-three".