402144444431 has 8 divisors (see below), whose sum is σ = 409741603920. Its totient is φ = 394547637952.

The previous prime is 402144444413. The next prime is 402144444437. The reversal of 402144444431 is 134444441204.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-402144444431 is a prime.

It is a super-2 number, since 2×402144444431² (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 = 402144444391 and 402144444400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402144444437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3882491 + ... + 3984723.

It is an arithmetic number, because the mean of its divisors is an integer number (51217700490).

Almost surely, 2^402144444431 is an apocalyptic number.

402144444431 is a deficient number, since it is larger than the sum of its proper divisors (7597159489).

402144444431 is a wasteful number, since it uses less digits than its factorization.

402144444431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176505.

The product of its (nonzero) digits is 98304, while the sum is 35.

Adding to 402144444431 its reverse (134444441204), we get a palindrome (536588885635).

The spelling of 402144444431 in words is "four hundred two billion, one hundred forty-four million, four hundred forty-four thousand, four hundred thirty-one".