42344640 has 336 divisors, whose sum is σ = 167335200. Its totient is φ = 10063872.

The previous prime is 42344593. The next prime is 42344651. The reversal of 42344640 is 4644324.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1460146 + ... + 1460174.

Almost surely, 2^42344640 is an apocalyptic number.

42344640 is a gapful number since it is divisible by the number (40) 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 42344640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (83667600).

42344640 is an abundant number, since it is smaller than the sum of its proper divisors (124990560).

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

42344640 is a wasteful number, since it uses less digits than its factorization.

42344640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 81 (or 52 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 27.

The square root of 42344640 is about 6507.2759277596. The cubic root of 42344640 is about 348.5508517307.

Adding to 42344640 its reverse (4644324), we get a palindrome (46988964).

The spelling of 42344640 in words is "forty-two million, three hundred forty-four thousand, six hundred forty".