402444134484 has 96 divisors (see below), whose sum is σ = 1130451732480. Its totient is φ = 108856649088.

The previous prime is 402444134483. The next prime is 402444134497. The reversal of 402444134484 is 484431444204.

It is a happy number.

It is a super-2 number, since 2×402444134484² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (402444134483) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2232217 + ... + 2405759.

It is an arithmetic number, because the mean of its divisors is an integer number (11775538880).

Almost surely, 2^402444134484 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 402444134484, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (565225866240).

402444134484 is an abundant number, since it is smaller than the sum of its proper divisors (728007597996).

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

402444134484 is a wasteful number, since it uses less digits than its factorization.

402444134484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175029 (or 175027 counting only the distinct ones).

The product of its (nonzero) digits is 786432, while the sum is 42.

Adding to 402444134484 its reverse (484431444204), we get a palindrome (886875578688).

The spelling of 402444134484 in words is "four hundred two billion, four hundred forty-four million, one hundred thirty-four thousand, four hundred eighty-four".