42427881 has 10 divisors (see below), whose sum is σ = 63380042. Its totient is φ = 28285200.

The previous prime is 42427877. The next prime is 42427883. The reversal of 42427881 is 18872424.

It can be written as a sum of positive squares in only one way, i.e., 39803481 + 2624400 = 6309^2 + 1620^2 .

It is not a de Polignac number, because 42427881 - 2² = 42427877 is a prime.

It is a super-2 number, since 2×42427881² = 3600250172300322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42427883) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 261820 + ... + 261981.

Almost surely, 2^42427881 is an apocalyptic number.

It is an amenable number.

42427881 is a deficient number, since it is larger than the sum of its proper divisors (20952161).

42427881 is an equidigital number, since it uses as much as digits as its factorization.

42427881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 523813 (or 523804 counting only the distinct ones).

The product of its digits is 28672, while the sum is 36.

The square root of 42427881 is about 6513.6687818771. The cubic root of 42427881 is about 348.7790957342.

The spelling of 42427881 in words is "forty-two million, four hundred twenty-seven thousand, eight hundred eighty-one".