42398665 has 4 divisors (see below), whose sum is σ = 50878404. Its totient is φ = 33918928.

The previous prime is 42398659. The next prime is 42398687. The reversal of 42398665 is 56689324.

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 19079424 + 23319241 = 4368^2 + 4829^2 .

It is a cyclic number.

It is not a de Polignac number, because 42398665 - 2¹⁹ = 41874377 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, 4239862 + ... + 4239871.

It is an arithmetic number, because the mean of its divisors is an integer number (12719601).

Almost surely, 2^42398665 is an apocalyptic number.

It is an amenable number.

42398665 is a deficient number, since it is larger than the sum of its proper divisors (8479739).

42398665 is an equidigital number, since it uses as much as digits as its factorization.

42398665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8479738.

The product of its digits is 311040, while the sum is 43.

The square root of 42398665 is about 6511.4257271353. The cubic root of 42398665 is about 348.6990204813.

The spelling of 42398665 in words is "forty-two million, three hundred ninety-eight thousand, six hundred sixty-five".