42521724 has 36 divisors (see below), whose sum is σ = 122841264. Its totient is φ = 12148992.

The previous prime is 42521719. The next prime is 42521737. The reversal of 42521724 is 42712524.

42521724 is a `hidden beast` number, since 425 + 217 + 24 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 84117 + ... + 84620.

Almost surely, 2^42521724 is an apocalyptic number.

It is an amenable number.

42521724 is an abundant number, since it is smaller than the sum of its proper divisors (80319540).

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

42521724 is a wasteful number, since it uses less digits than its factorization.

42521724 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 168754 (or 168749 counting only the distinct ones).

The product of its digits is 4480, while the sum is 27.

The square root of 42521724 is about 6520.8683470838. The cubic root of 42521724 is about 349.0360523561.

The spelling of 42521724 in words is "forty-two million, five hundred twenty-one thousand, seven hundred twenty-four".