18199450 has 12 divisors (see below), whose sum is σ = 33851070. Its totient is φ = 7279760.

The previous prime is 18199429. The next prime is 18199459. The reversal of 18199450 is 5499181.

It can be written as a sum of positive squares in 3 ways, for example, as 12453841 + 5745609 = 3529^2 + 2397^2 .

It is not an unprimeable number, because it can be changed into a prime (18199459) by changing a digit.

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 5 ways as a sum of consecutive naturals, for example, 181945 + ... + 182044.

Almost surely, 2^18199450 is an apocalyptic number.

18199450 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18199450 is a deficient number, since it is larger than the sum of its proper divisors (15651620).

18199450 is a wasteful number, since it uses less digits than its factorization.

18199450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 364001 (or 363996 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 37.

The square root of 18199450 is about 4266.0813400590. The cubic root of 18199450 is about 263.0385617193.

The spelling of 18199450 in words is "eighteen million, one hundred ninety-nine thousand, four hundred fifty".