42877521 has 24 divisors (see below), whose sum is σ = 63343904. Its totient is φ = 27941760.

The previous prime is 42877453. The next prime is 42877529. The reversal of 42877521 is 12577824.

It is not a de Polignac number, because 42877521 - 2¹⁰ = 42876497 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42877529) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 127065 + ... + 127401.

Almost surely, 2^42877521 is an apocalyptic number.

It is an amenable number.

42877521 is a deficient number, since it is larger than the sum of its proper divisors (20466383).

42877521 is a wasteful number, since it uses less digits than its factorization.

42877521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621 (or 618 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 42877521 is about 6548.0929284793. The cubic root of 42877521 is about 350.0068597295.

The spelling of 42877521 in words is "forty-two million, eight hundred seventy-seven thousand, five hundred twenty-one".