18399748 has 12 divisors (see below), whose sum is σ = 32884992. Its totient is φ = 9004040.

The previous prime is 18399737. The next prime is 18399749. The reversal of 18399748 is 84799381.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (18399749) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 48748 + ... + 49123.

It is an arithmetic number, because the mean of its divisors is an integer number (2740416).

Almost surely, 2^18399748 is an apocalyptic number.

It is an amenable number.

18399748 is a deficient number, since it is larger than the sum of its proper divisors (14485244).

18399748 is a wasteful number, since it uses less digits than its factorization.

18399748 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97922 (or 97920 counting only the distinct ones).

The product of its digits is 435456, while the sum is 49.

The square root of 18399748 is about 4289.4927439034. The cubic root of 18399748 is about 264.0000191307. Note that the first 4 decimals are identical.

The spelling of 18399748 in words is "eighteen million, three hundred ninety-nine thousand, seven hundred forty-eight".