402144444220 has 24 divisors (see below), whose sum is σ = 844521953184. Its totient is φ = 160854230976.

The previous prime is 402144444187. The next prime is 402144444241. The reversal of 402144444220 is 22444441204.

It is a happy number.

It is a super-3 number, since 3×402144444220³ (a number of 36 digits) contains 333 as substring.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 829714 + ... + 1221766.

It is an arithmetic number, because the mean of its divisors is an integer number (35188414716).

Almost surely, 2^402144444220 is an apocalyptic number.

It is an amenable number.

402144444220 is an abundant number, since it is smaller than the sum of its proper divisors (442377508964).

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

402144444220 is a wasteful number, since it uses less digits than its factorization.

402144444220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 443349 (or 443347 counting only the distinct ones).

The product of its (nonzero) digits is 32768, while the sum is 31.

Adding to 402144444220 its reverse (22444441204), we get a palindrome (424588885424).

The spelling of 402144444220 in words is "four hundred two billion, one hundred forty-four million, four hundred forty-four thousand, two hundred twenty".