42117385 has 4 divisors (see below), whose sum is σ = 50540868. Its totient is φ = 33693904.

The previous prime is 42117377. The next prime is 42117409. The reversal of 42117385 is 58371124.

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 26245129 + 15872256 = 5123^2 + 3984^2 .

It is a cyclic number.

It is not a de Polignac number, because 42117385 - 2³ = 42117377 is a prime.

It is a Duffinian 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, 4211734 + ... + 4211743.

It is an arithmetic number, because the mean of its divisors is an integer number (12635217).

Almost surely, 2^42117385 is an apocalyptic number.

It is an amenable number.

42117385 is a deficient number, since it is larger than the sum of its proper divisors (8423483).

42117385 is an equidigital number, since it uses as much as digits as its factorization.

42117385 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8423482.

The product of its digits is 6720, while the sum is 31.

The square root of 42117385 is about 6489.7908286785. The cubic root of 42117385 is about 347.9261992838.

The spelling of 42117385 in words is "forty-two million, one hundred seventeen thousand, three hundred eighty-five".