42485721 has 8 divisors (see below), whose sum is σ = 56760960. Its totient is φ = 28267152.

The previous prime is 42485719. The next prime is 42485743. The reversal of 42485721 is 12758424.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 42485721 - 2¹ = 42485719 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42485621) 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, 12385 + ... + 15438.

It is an arithmetic number, because the mean of its divisors is an integer number (7095120).

Almost surely, 2^42485721 is an apocalyptic number.

It is an amenable number.

42485721 is a deficient number, since it is larger than the sum of its proper divisors (14275239).

42485721 is a wasteful number, since it uses less digits than its factorization.

42485721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28335.

The product of its digits is 17920, while the sum is 33.

The square root of 42485721 is about 6518.1071638935. The cubic root of 42485721 is about 348.9375153253.

The spelling of 42485721 in words is "forty-two million, four hundred eighty-five thousand, seven hundred twenty-one".