18304442 has 8 divisors (see below), whose sum is σ = 29568756. Its totient is φ = 8448192.

The previous prime is 18304417. The next prime is 18304459. The reversal of 18304442 is 24440381.

It can be written as a sum of positive squares in 2 ways, for example, as 18241441 + 63001 = 4271^2 + 251^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (26), and also a Moran number because the ratio is a prime number: 704017 = 18304442 / (1 + 8 + 3 + 0 + 4 + 4 + 4 + 2).

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, 351983 + ... + 352034.

Almost surely, 2^18304442 is an apocalyptic number.

18304442 is a deficient number, since it is larger than the sum of its proper divisors (11264314).

18304442 is a wasteful number, since it uses less digits than its factorization.

18304442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704032.

The product of its (nonzero) digits is 3072, while the sum is 26.

The square root of 18304442 is about 4278.3690817881. The cubic root of 18304442 is about 263.5434122718.

The spelling of 18304442 in words is "eighteen million, three hundred four thousand, four hundred forty-two".