402144140 has 12 divisors (see below), whose sum is σ = 844502736. Its totient is φ = 160857648.

The previous prime is 402144137. The next prime is 402144161. The reversal of 402144140 is 41441204.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (20), and also a Moran number because the ratio is a prime number: 20107207 = 402144140 / (4 + 0 + 2 + 1 + 4 + 4 + 1 + 4 + 0).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10053584 + ... + 10053623.

It is an arithmetic number, because the mean of its divisors is an integer number (70375228).

Almost surely, 2^402144140 is an apocalyptic number.

It is an amenable number.

402144140 is an abundant number, since it is smaller than the sum of its proper divisors (442358596).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

402144140 is a wasteful number, since it uses less digits than its factorization.

402144140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20107216 (or 20107214 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 402144140 is about 20053.5318585031. The cubic root of 402144140 is about 738.1204676007.

Adding to 402144140 its reverse (41441204), we get a palindrome (443585344).

The spelling of 402144140 in words is "four hundred two million, one hundred forty-four thousand, one hundred forty".