42891444 has 48 divisors (see below), whose sum is σ = 112595840. Its totient is φ = 14294232.

The previous prime is 42891427. The next prime is 42891461. The reversal of 42891444 is 44419824.

42891444 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (42891427) and next prime (42891461).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a nialpdrome in base 9.

It is a junction number, because it is equal to n+sod(n) for n = 42891399 and 42891408.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6297 + ... + 11199.

Almost surely, 2^42891444 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 42891444, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56297920).

42891444 is an abundant number, since it is smaller than the sum of its proper divisors (69704396).

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

42891444 is an equidigital number, since it uses as much as digits as its factorization.

42891444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4928 (or 4908 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 42891444 is about 6549.1559761545. The cubic root of 42891444 is about 350.0447398590.

The spelling of 42891444 in words is "forty-two million, eight hundred ninety-one thousand, four hundred forty-four".