42639872 has 80 divisors (see below), whose sum is σ = 95163552. Its totient is φ = 18923520.

The previous prime is 42639871. The next prime is 42639887. The reversal of 42639872 is 27893624.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (42639871) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 377288 + ... + 377400.

Almost surely, 2^42639872 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 42639872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47581776).

42639872 is an abundant number, since it is smaller than the sum of its proper divisors (52523680).

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

42639872 is a wasteful number, since it uses less digits than its factorization.

42639872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209 (or 193 counting only the distinct ones).

The product of its digits is 145152, while the sum is 41.

The square root of 42639872 is about 6529.9212858962. The cubic root of 42639872 is about 349.3590227727.

The spelling of 42639872 in words is "forty-two million, six hundred thirty-nine thousand, eight hundred seventy-two".