42904 has 16 divisors (see below), whose sum is σ = 83520. Its totient is φ = 20640.

The previous prime is 42901. The next prime is 42923. The reversal of 42904 is 40924.

42904 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a nialpdrome in base 15.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42901) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162 + ... + 334.

It is an arithmetic number, because the mean of its divisors is an integer number (5220).

2⁴²⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

42904 is a deficient number, since it is larger than the sum of its proper divisors (40616).

42904 is a wasteful number, since it uses less digits than its factorization.

42904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 210 (or 206 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 19.

The square root of 42904 is about 207.1328076380. The cubic root of 42904 is about 35.0078893780.

It can be divided in two parts, 42 and 904, that added together give a triangular number (946 = T₄₃).

The spelling of 42904 in words is "forty-two thousand, nine hundred four".