4042820 has 24 divisors (see below), whose sum is σ = 8937600. Its totient is φ = 1531872.

The previous prime is 4042807. The next prime is 4042823. The reversal of 4042820 is 282404.

It is a Harshad number since it is a multiple of its sum of digits (20).

It is a junction number, because it is equal to n+sod(n) for n = 4042792 and 4042801.

It is not an unprimeable number, because it can be changed into a prime (4042823) 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, 4940 + ... + 5699.

It is an arithmetic number, because the mean of its divisors is an integer number (372400).

Almost surely, 2^4042820 is an apocalyptic number.

It is an amenable number.

4042820 is an abundant number, since it is smaller than the sum of its proper divisors (4894780).

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

4042820 is a wasteful number, since it uses less digits than its factorization.

4042820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10667 (or 10665 counting only the distinct ones).

The product of its (nonzero) digits is 512, while the sum is 20.

The square root of 4042820 is about 2010.6765030705. The cubic root of 4042820 is about 159.3045335030.

The spelling of 4042820 in words is "four million, forty-two thousand, eight hundred twenty".