42981804 has 18 divisors (see below), whose sum is σ = 108648540. Its totient is φ = 14327256.

The previous prime is 42981803. The next prime is 42981821. The reversal of 42981804 is 40818924.

It is a tau number, because it is divible by the number of its divisors (18).

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 1193939 = 42981804 / (4 + 2 + 9 + 8 + 1 + 8 + 0 + 4).

It is not an unprimeable number, because it can be changed into a prime (42981803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 596934 + ... + 597005.

It is an arithmetic number, because the mean of its divisors is an integer number (6036030).

Almost surely, 2^42981804 is an apocalyptic number.

It is an amenable number.

42981804 is an abundant number, since it is smaller than the sum of its proper divisors (65666736).

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

42981804 is a wasteful number, since it uses less digits than its factorization.

42981804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1193949 (or 1193944 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 42981804 is about 6556.0509455007. The cubic root of 42981804 is about 350.2903821432.

The spelling of 42981804 in words is "forty-two million, nine hundred eighty-one thousand, eight hundred four".