42163685 has 4 divisors (see below), whose sum is σ = 50596428. Its totient is φ = 33730944.

The previous prime is 42163657. The next prime is 42163697. The reversal of 42163685 is 58636124.

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

It can be written as a sum of positive squares in 2 ways, for example, as 28153636 + 14010049 = 5306^2 + 3743^2 .

It is a cyclic number.

It is not a de Polignac number, because 42163685 - 2¹⁶ = 42098149 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, 4216364 + ... + 4216373.

It is an arithmetic number, because the mean of its divisors is an integer number (12649107).

Almost surely, 2^42163685 is an apocalyptic number.

It is an amenable number.

42163685 is a deficient number, since it is larger than the sum of its proper divisors (8432743).

42163685 is an equidigital number, since it uses as much as digits as its factorization.

42163685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8432742.

The product of its digits is 34560, while the sum is 35.

The square root of 42163685 is about 6493.3569900322. The cubic root of 42163685 is about 348.0536453390.

The spelling of 42163685 in words is "forty-two million, one hundred sixty-three thousand, six hundred eighty-five".