42156444 has 48 divisors (see below), whose sum is σ = 109146240. Its totient is φ = 12555840.

The previous prime is 42156419. The next prime is 42156451. The reversal of 42156444 is 44465124.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5082 + ... + 10494.

It is an arithmetic number, because the mean of its divisors is an integer number (2273880).

Almost surely, 2^42156444 is an apocalyptic number.

42156444 is a gapful number since it is divisible by the number (44) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42156444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54573120).

42156444 is an abundant number, since it is smaller than the sum of its proper divisors (66989796).

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

42156444 is a wasteful number, since it uses less digits than its factorization.

42156444 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5490 (or 5488 counting only the distinct ones).

The product of its digits is 15360, while the sum is 30.

The square root of 42156444 is about 6492.7993962543. The cubic root of 42156444 is about 348.0337198136.

It can be divided in two parts, 421 and 56444, that added together give a palindrome (56865).

The spelling of 42156444 in words is "forty-two million, one hundred fifty-six thousand, four hundred forty-four".