402444042 has 128 divisors (see below), whose sum is σ = 1110509568. Its totient is φ = 93830400.

The previous prime is 402444019. The next prime is 402444071. The reversal of 402444042 is 240444204.

It is a super-2 number, since 2×402444042² = 323922413882595528, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 221317 + ... + 223127.

It is an arithmetic number, because the mean of its divisors is an integer number (8675856).

Almost surely, 2^402444042 is an apocalyptic number.

402444042 is a gapful number since it is divisible by the number (42) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 402444042, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (555254784).

402444042 is an abundant number, since it is smaller than the sum of its proper divisors (708065526).

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

402444042 is a wasteful number, since it uses less digits than its factorization.

402444042 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1884.

The product of its (nonzero) digits is 4096, while the sum is 24.

The square root of 402444042 is about 20061.0080005966. The cubic root of 402444042 is about 738.3039082938.

Adding to 402444042 its reverse (240444204), we get a palindrome (642888246).

It can be divided in two parts, 402 and 444042, that added together give a palindrome (444444).

The spelling of 402444042 in words is "four hundred two million, four hundred forty-four thousand, forty-two".