42208440 has 64 divisors (see below), whose sum is σ = 127301760. Its totient is φ = 11195520.

The previous prime is 42208421. The next prime is 42208451. The reversal of 42208440 is 4480224.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 42208440.

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, 24487 + ... + 26153.

It is an arithmetic number, because the mean of its divisors is an integer number (1989090).

Almost surely, 2^42208440 is an apocalyptic number.

42208440 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 42208440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63650880).

42208440 is an abundant number, since it is smaller than the sum of its proper divisors (85093320).

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

42208440 is a wasteful number, since it uses less digits than its factorization.

42208440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1892 (or 1888 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 24.

The square root of 42208440 is about 6496.8022903579. The cubic root of 42208440 is about 348.1767499542.

Adding to 42208440 its reverse (4480224), we get a palindrome (46688664).

The spelling of 42208440 in words is "forty-two million, two hundred eight thousand, four hundred forty".