402440442331 has 4 divisors (see below), whose sum is σ = 402503065912. Its totient is φ = 402377818752.

The previous prime is 402440442311. The next prime is 402440442337. The reversal of 402440442331 is 133244044204.

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 402440442331 - 2¹⁵ = 402440409563 is a prime.

It is a super-2 number, since 2×402440442331² (a number of 24 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 402440442293 and 402440442302.

It is not an unprimeable number, because it can be changed into a prime (402440442337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 31302150 + ... + 31315003.

It is an arithmetic number, because the mean of its divisors is an integer number (100625766478).

Almost surely, 2^402440442331 is an apocalyptic number.

402440442331 is a deficient number, since it is larger than the sum of its proper divisors (62623581).

402440442331 is an equidigital number, since it uses as much as digits as its factorization.

402440442331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62623580.

The product of its (nonzero) digits is 36864, while the sum is 31.

Adding to 402440442331 its reverse (133244044204), we get a palindrome (535684486535).

The spelling of 402440442331 in words is "four hundred two billion, four hundred forty million, four hundred forty-two thousand, three hundred thirty-one".