18449390 has 8 divisors (see below), whose sum is σ = 33208920. Its totient is φ = 7379752.

The previous prime is 18449383. The next prime is 18449401. The reversal of 18449390 is 9394481.

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

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 922460 + ... + 922479.

It is an arithmetic number, because the mean of its divisors is an integer number (4151115).

Almost surely, 2^18449390 is an apocalyptic number.

18449390 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18449390 is a deficient number, since it is larger than the sum of its proper divisors (14759530).

18449390 is a wasteful number, since it uses less digits than its factorization.

18449390 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1844946.

The product of its (nonzero) digits is 31104, while the sum is 38.

The square root of 18449390 is about 4295.2753113159. The cubic root of 18449390 is about 264.2372274610.

The spelling of 18449390 in words is "eighteen million, four hundred forty-nine thousand, three hundred ninety".