2042840 has 16 divisors (see below), whose sum is σ = 4596480. Its totient is φ = 817120.

The previous prime is 2042819. The next prime is 2042849. The reversal of 2042840 is 482402.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2042849) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 25496 + ... + 25575.

It is an arithmetic number, because the mean of its divisors is an integer number (287280).

2^2042840 is an apocalyptic number.

2042840 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

2042840 is an abundant number, since it is smaller than the sum of its proper divisors (2553640).

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

2042840 is a wasteful number, since it uses less digits than its factorization.

2042840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51082 (or 51078 counting only the distinct ones).

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

The square root of 2042840 is about 1429.2795387887. The cubic root of 2042840 is about 126.8853409514.

It can be divided in two parts, 2042 and 840, that added together give a palindrome (2882).

The spelling of 2042840 in words is "two million, forty-two thousand, eight hundred forty".