442135904 has 24 divisors (see below), whose sum is σ = 994806288. Its totient is φ = 189486720.

The previous prime is 442135901. The next prime is 442135921. The reversal of 442135904 is 409531244.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (442135901) 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, 986687 + ... + 987134.

It is an arithmetic number, because the mean of its divisors is an integer number (41450262).

Almost surely, 2^442135904 is an apocalyptic number.

It is an amenable number.

442135904 is an abundant number, since it is smaller than the sum of its proper divisors (552670384).

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

442135904 is a wasteful number, since it uses less digits than its factorization.

442135904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1973838 (or 1973830 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 442135904 is about 21027.0279402487. The cubic root of 442135904 is about 761.8192244588.

The spelling of 442135904 in words is "four hundred forty-two million, one hundred thirty-five thousand, nine hundred four".