402440012142431 has 4 divisors (see below), whose sum is σ = 402444255192000. Its totient is φ = 402435769092864.

The previous prime is 402440012142419. The next prime is 402440012142439. The reversal of 402440012142431 is 134241210044204.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402440012142431 is a prime.

It is a super-2 number, since 2×402440012142431² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402440012142439) 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, 2121382511 + ... + 2121572208.

It is an arithmetic number, because the mean of its divisors is an integer number (100611063798000).

Almost surely, 2^{402440012142431} is an apocalyptic number.

402440012142431 is a deficient number, since it is larger than the sum of its proper divisors (4243049569).

402440012142431 is an equidigital number, since it uses as much as digits as its factorization.

402440012142431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4243049568.

The product of its (nonzero) digits is 24576, while the sum is 32.

Adding to 402440012142431 its reverse (134241210044204), we get a palindrome (536681222186635).

The spelling of 402440012142431 in words is "four hundred two trillion, four hundred forty billion, twelve million, one hundred forty-two thousand, four hundred thirty-one".