42421685 has 4 divisors (see below), whose sum is σ = 50906028. Its totient is φ = 33937344.

The previous prime is 42421667. The next prime is 42421703. The reversal of 42421685 is 58612424.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (42421667) and next prime (42421703).

It can be written as a sum of positive squares in 2 ways, for example, as 6589489 + 35832196 = 2567^2 + 5986^2 .

It is a cyclic number.

It is not a de Polignac number, because 42421685 - 2²⁰ = 41373109 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4242164 + ... + 4242173.

It is an arithmetic number, because the mean of its divisors is an integer number (12726507).

Almost surely, 2^42421685 is an apocalyptic number.

It is an amenable number.

42421685 is a deficient number, since it is larger than the sum of its proper divisors (8484343).

42421685 is an equidigital number, since it uses as much as digits as its factorization.

42421685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8484342.

The product of its digits is 15360, while the sum is 32.

The square root of 42421685 is about 6513.1931492932. The cubic root of 42421685 is about 348.7621168009.

The spelling of 42421685 in words is "forty-two million, four hundred twenty-one thousand, six hundred eighty-five".