42505904 has 40 divisors (see below), whose sum is σ = 94660608. Its totient is φ = 18112320.

The previous prime is 42505891. The next prime is 42505913. The reversal of 42505904 is 40950524.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20399 + ... + 22385.

Almost surely, 2^42505904 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42505904, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47330304).

42505904 is an abundant number, since it is smaller than the sum of its proper divisors (52154704).

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

42505904 is a wasteful number, since it uses less digits than its factorization.

42505904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2193 (or 2187 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 42505904 is about 6519.6552056071. The cubic root of 42505904 is about 348.9927612667.

The spelling of 42505904 in words is "forty-two million, five hundred five thousand, nine hundred four".