18442705 has 8 divisors (see below), whose sum is σ = 23433192. Its totient is φ = 13886208.

The previous prime is 18442693. The next prime is 18442709. The reversal of 18442705 is 50724481.

It can be written as a sum of positive squares in 4 ways, for example, as 4892944 + 13549761 = 2212^2 + 3681^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18442705 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18442709) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 108402 + ... + 108571.

It is an arithmetic number, because the mean of its divisors is an integer number (2929149).

Almost surely, 2^18442705 is an apocalyptic number.

It is an amenable number.

18442705 is a deficient number, since it is larger than the sum of its proper divisors (4990487).

18442705 is a wasteful number, since it uses less digits than its factorization.

18442705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 216995.

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 18442705 is about 4294.4970601923. The cubic root of 18442705 is about 264.2053088039.

The spelling of 18442705 in words is "eighteen million, four hundred forty-two thousand, seven hundred five".