42008004 has 24 divisors (see below), whose sum is σ = 108909920. Its totient is φ = 14002632.

The previous prime is 42007997. The next prime is 42008009. The reversal of 42008004 is 40080024.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is not an unprimeable number, because it can be changed into a prime (42008009) 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, 194374 + ... + 194589.

Almost surely, 2^42008004 is an apocalyptic number.

It is an amenable number.

42008004 is an abundant number, since it is smaller than the sum of its proper divisors (66901916).

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

42008004 is a wasteful number, since it uses less digits than its factorization.

42008004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 388976 (or 388968 counting only the distinct ones).

The product of its (nonzero) digits is 256, while the sum is 18.

The square root of 42008004 is about 6481.3581909967. The cubic root of 42008004 is about 347.6247441316.

Adding to 42008004 its reverse (40080024), we get a palindrome (82088028).

The spelling of 42008004 in words is "forty-two million, eight thousand, four".