18449490 has 16 divisors (see below), whose sum is σ = 44278848. Its totient is φ = 4919856.

The previous prime is 18449443. The next prime is 18449491. The reversal of 18449490 is 9494481.

It is not an unprimeable number, because it can be changed into a prime (18449491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 307462 + ... + 307521.

It is an arithmetic number, because the mean of its divisors is an integer number (2767428).

Almost surely, 2^18449490 is an apocalyptic number.

18449490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18449490 is an abundant number, since it is smaller than the sum of its proper divisors (25829358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18449490 is a wasteful number, since it uses less digits than its factorization.

18449490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 614993.

The product of its (nonzero) digits is 41472, while the sum is 39.

The square root of 18449490 is about 4295.2869519975. The cubic root of 18449490 is about 264.2377048693.

The spelling of 18449490 in words is "eighteen million, four hundred forty-nine thousand, four hundred ninety".