402144309988 has 24 divisors (see below), whose sum is σ = 728099479800. Its totient is φ = 194117403648.

The previous prime is 402144309947. The next prime is 402144309989. The reversal of 402144309988 is 889903441204.

It can be written as a sum of positive squares in 4 ways, for example, as 42093908224 + 360050401764 = 205168^2 + 600042^2 .

It is not an unprimeable number, because it can be changed into a prime (402144309989) 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, 902878 + ... + 1272586.

It is an arithmetic number, because the mean of its divisors is an integer number (30337478325).

Almost surely, 2^402144309988 is an apocalyptic number.

It is an amenable number.

402144309988 is a deficient number, since it is larger than the sum of its proper divisors (325955169812).

402144309988 is a wasteful number, since it uses less digits than its factorization.

402144309988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 379119 (or 379117 counting only the distinct ones).

The product of its (nonzero) digits is 1990656, while the sum is 52.

The spelling of 402144309988 in words is "four hundred two billion, one hundred forty-four million, three hundred nine thousand, nine hundred eighty-eight".