18449906 has 4 divisors (see below), whose sum is σ = 27674862. Its totient is φ = 9224952.

The previous prime is 18449891. The next prime is 18449911. The reversal of 18449906 is 60994481.

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., 10660225 + 7789681 = 3265^2 + 2791^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4612475 + ... + 4612478.

Almost surely, 2^18449906 is an apocalyptic number.

18449906 is a deficient number, since it is larger than the sum of its proper divisors (9224956).

18449906 is an equidigital number, since it uses as much as digits as its factorization.

18449906 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9224955.

The product of its (nonzero) digits is 62208, while the sum is 41.

The square root of 18449906 is about 4295.3353768943. The cubic root of 18449906 is about 264.2396908693.

The spelling of 18449906 in words is "eighteen million, four hundred forty-nine thousand, nine hundred six".