42991344 has 160 divisors (see below), whose sum is σ = 137491200. Its totient is φ = 12752640.

The previous prime is 42991337. The next prime is 42991349. The reversal of 42991344 is 44319924.

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

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 42991299 and 42991308.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42991349) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 394362 + ... + 394470.

It is an arithmetic number, because the mean of its divisors is an integer number (859320).

Almost surely, 2^42991344 is an apocalyptic number.

42991344 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 42991344, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68745600).

42991344 is an abundant number, since it is smaller than the sum of its proper divisors (94499856).

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

42991344 is a wasteful number, since it uses less digits than its factorization.

42991344 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220 (or 208 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 42991344 is about 6556.7784772707. The cubic root of 42991344 is about 350.3162963885.

The spelling of 42991344 in words is "forty-two million, nine hundred ninety-one thousand, three hundred forty-four".