18299649 has 4 divisors (see below), whose sum is σ = 24399536. Its totient is φ = 12199764.

The previous prime is 18299647. The next prime is 18299663. The reversal of 18299649 is 94699281.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 94699281 = 3 ⋅31566427.

It is not a de Polignac number, because 18299649 - 2¹ = 18299647 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18299598 and 18299607.

It is not an unprimeable number, because it can be changed into a prime (18299647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3049939 + ... + 3049944.

It is an arithmetic number, because the mean of its divisors is an integer number (6099884).

Almost surely, 2^18299649 is an apocalyptic number.

It is an amenable number.

18299649 is a deficient number, since it is larger than the sum of its proper divisors (6099887).

18299649 is an equidigital number, since it uses as much as digits as its factorization.

18299649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6099886.

The product of its digits is 279936, while the sum is 48.

The square root of 18299649 is about 4277.8089017627. The cubic root of 18299649 is about 263.5204074033.

The spelling of 18299649 in words is "eighteen million, two hundred ninety-nine thousand, six hundred forty-nine".