42866820 has 120 divisors (see below), whose sum is σ = 137579904. Its totient is φ = 11168064.

The previous prime is 42866819. The next prime is 42866827. The reversal of 42866820 is 2866824.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (42866827) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 75859 + ... + 76421.

Almost surely, 2^42866820 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 42866820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68789952).

42866820 is an abundant number, since it is smaller than the sum of its proper divisors (94713084).

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

42866820 is a wasteful number, since it uses less digits than its factorization.

42866820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 631 (or 620 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 42866820 is about 6547.2757693563. The cubic root of 42866820 is about 349.9777400809.

The spelling of 42866820 in words is "forty-two million, eight hundred sixty-six thousand, eight hundred twenty".