18205442 has 8 divisors (see below), whose sum is σ = 27327756. Its totient is φ = 9096192.

The previous prime is 18205433. The next prime is 18205457. The reversal of 18205442 is 24450281.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 17547721 + 657721 = 4189^2 + 811^2 .

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

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, 1778 + ... + 6290.

Almost surely, 2^18205442 is an apocalyptic number.

18205442 is a deficient number, since it is larger than the sum of its proper divisors (9122314).

18205442 is a wasteful number, since it uses less digits than its factorization.

18205442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6532.

The product of its (nonzero) digits is 2560, while the sum is 26.

The square root of 18205442 is about 4266.7835661069. The cubic root of 18205442 is about 263.0674262202.

The spelling of 18205442 in words is "eighteen million, two hundred five thousand, four hundred forty-two".