18493399 has 12 divisors (see below), whose sum is σ = 19893600. Its totient is φ = 17186048.

The previous prime is 18493393. The next prime is 18493421. The reversal of 18493399 is 99339481.

It is a de Polignac number, because none of the positive numbers 2^k-18493399 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18493393) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 25362 + ... + 26080.

It is an arithmetic number, because the mean of its divisors is an integer number (1657800).

Almost surely, 2^18493399 is an apocalyptic number.

18493399 is a deficient number, since it is larger than the sum of its proper divisors (1400201).

18493399 is an equidigital number, since it uses as much as digits as its factorization.

18493399 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 842 (or 825 counting only the distinct ones).

The product of its digits is 209952, while the sum is 46.

The square root of 18493399 is about 4300.3952143960. The cubic root of 18493399 is about 264.4471636153.

The spelling of 18493399 in words is "eighteen million, four hundred ninety-three thousand, three hundred ninety-nine".