42879820 has 72 divisors (see below), whose sum is σ = 98092512. Its totient is φ = 15713280.

The previous prime is 42879817. The next prime is 42879829. The reversal of 42879820 is 2897824.

It is not an unprimeable number, because it can be changed into a prime (42879829) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 442012 + ... + 442108.

It is an arithmetic number, because the mean of its divisors is an integer number (1362396).

Almost surely, 2^42879820 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 42879820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49046256).

42879820 is an abundant number, since it is smaller than the sum of its proper divisors (55212692).

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

42879820 is a wasteful number, since it uses less digits than its factorization.

42879820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 191 (or 158 counting only the distinct ones).

The product of its (nonzero) digits is 64512, while the sum is 40.

The square root of 42879820 is about 6548.2684734210. The cubic root of 42879820 is about 350.0131151548.

The spelling of 42879820 in words is "forty-two million, eight hundred seventy-nine thousand, eight hundred twenty".