42388165 has 4 divisors (see below), whose sum is σ = 50865804. Its totient is φ = 33910528.

The previous prime is 42388117. The next prime is 42388217. The reversal of 42388165 is 56188324.

It is a happy number.

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 10556001 + 31832164 = 3249^2 + 5642^2 .

It is a cyclic number.

It is not a de Polignac number, because 42388165 - 2⁷ = 42388037 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, 4238812 + ... + 4238821.

It is an arithmetic number, because the mean of its divisors is an integer number (12716451).

Almost surely, 2^42388165 is an apocalyptic number.

It is an amenable number.

42388165 is a deficient number, since it is larger than the sum of its proper divisors (8477639).

42388165 is an equidigital number, since it uses as much as digits as its factorization.

42388165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8477638.

The product of its digits is 46080, while the sum is 37.

The square root of 42388165 is about 6510.6194021767. The cubic root of 42388165 is about 348.6702330812.

It can be divided in two parts, 4238 and 8165, that added together give a triangular number (12403 = T₁₅₇).

The spelling of 42388165 in words is "forty-two million, three hundred eighty-eight thousand, one hundred sixty-five".