42404165 has 4 divisors (see below), whose sum is σ = 50885004. Its totient is φ = 33923328.

The previous prime is 42404147. The next prime is 42404189. The reversal of 42404165 is 56140424.

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 33535681 + 8868484 = 5791^2 + 2978^2 .

It is a cyclic number.

It is not a de Polignac number, because 42404165 - 2¹² = 42400069 is a prime.

It is a super-2 number, since 2×42404165² = 3596226418694450, which contains 22 as substring.

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, 4240412 + ... + 4240421.

It is an arithmetic number, because the mean of its divisors is an integer number (12721251).

Almost surely, 2^42404165 is an apocalyptic number.

It is an amenable number.

42404165 is a deficient number, since it is larger than the sum of its proper divisors (8480839).

42404165 is an equidigital number, since it uses as much as digits as its factorization.

42404165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8480838.

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 42404165 is about 6511.8480479815. The cubic root of 42404165 is about 348.7140976989.

Adding to 42404165 its reverse (56140424), we get a palindrome (98544589).

The spelling of 42404165 in words is "forty-two million, four hundred four thousand, one hundred sixty-five".