42587421 has 16 divisors (see below), whose sum is σ = 59512320. Its totient is φ = 27038000.

The previous prime is 42587401. The next prime is 42587429. The reversal of 42587421 is 12478524.

42587421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a cyclic number.

It is not a de Polignac number, because 42587421 - 2⁹ = 42586909 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42587429) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16090 + ... + 18548.

It is an arithmetic number, because the mean of its divisors is an integer number (3719520).

Almost surely, 2^42587421 is an apocalyptic number.

It is an amenable number.

42587421 is a deficient number, since it is larger than the sum of its proper divisors (16924899).

42587421 is a wasteful number, since it uses less digits than its factorization.

42587421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2736.

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

The square root of 42587421 is about 6525.9038454455. The cubic root of 42587421 is about 349.2157159889.

The spelling of 42587421 in words is "forty-two million, five hundred eighty-seven thousand, four hundred twenty-one".