18449899 has 6 divisors (see below), whose sum is σ = 19978476. Its totient is φ = 17030520.

The previous prime is 18449891. The next prime is 18449911. The reversal of 18449899 is 99894481.

It is a happy number.

It is not a de Polignac number, because 18449899 - 2³ = 18449891 is a prime.

It is a super-2 number, since 2×18449899² = 680797546220402, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18449891) 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, 54417 + ... + 54754.

It is an arithmetic number, because the mean of its divisors is an integer number (3329746).

Almost surely, 2^18449899 is an apocalyptic number.

18449899 is a deficient number, since it is larger than the sum of its proper divisors (1528577).

18449899 is a wasteful number, since it uses less digits than its factorization.

18449899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 109197 (or 109184 counting only the distinct ones).

The product of its digits is 746496, while the sum is 52.

The square root of 18449899 is about 4295.3345620568. The cubic root of 18449899 is about 264.2396574512.

The spelling of 18449899 in words is "eighteen million, four hundred forty-nine thousand, eight hundred ninety-nine".