18415442 has 4 divisors (see below), whose sum is σ = 27623166. Its totient is φ = 9207720.

The previous prime is 18415429. The next prime is 18415477. The reversal of 18415442 is 24451481.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 16168441 + 2247001 = 4021^2 + 1499^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4603859 + ... + 4603862.

Almost surely, 2^18415442 is an apocalyptic number.

18415442 is a deficient number, since it is larger than the sum of its proper divisors (9207724).

18415442 is an equidigital number, since it uses as much as digits as its factorization.

18415442 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9207723.

The product of its digits is 5120, while the sum is 29.

The square root of 18415442 is about 4291.3217078192. The cubic root of 18415442 is about 264.0750570946.

The spelling of 18415442 in words is "eighteen million, four hundred fifteen thousand, four hundred forty-two".