42251808 has 48 divisors (see below), whose sum is σ = 112583520. Its totient is φ = 13871616.

The previous prime is 42251789. The next prime is 42251809. The reversal of 42251808 is 80815224.

It is a tau number, because it is divible by the number of its divisors (48).

It is not an unprimeable number, because it can be changed into a prime (42251809) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3148 + ... + 9716.

It is an arithmetic number, because the mean of its divisors is an integer number (2345490).

Almost surely, 2^42251808 is an apocalyptic number.

42251808 is a gapful number since it is divisible by the number (48) 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 42251808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56291760).

42251808 is an abundant number, since it is smaller than the sum of its proper divisors (70331712).

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

42251808 is a wasteful number, since it uses less digits than its factorization.

42251808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6649 (or 6641 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 30.

The square root of 42251808 is about 6500.1390754352. The cubic root of 42251808 is about 348.2959564503.

The spelling of 42251808 in words is "forty-two million, two hundred fifty-one thousand, eight hundred eight".