18499819 has 8 divisors (see below), whose sum is σ = 20013840. Its totient is φ = 16998816.

The previous prime is 18499801. The next prime is 18499823. The reversal of 18499819 is 91899481.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18499819 - 2¹⁵ = 18467051 is a prime.

It is a super-2 number, since 2×18499819² = 684486606065522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18499849) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 184 + ... + 6085.

It is an arithmetic number, because the mean of its divisors is an integer number (2501730).

Almost surely, 2^18499819 is an apocalyptic number.

18499819 is a deficient number, since it is larger than the sum of its proper divisors (1514021).

18499819 is a wasteful number, since it uses less digits than its factorization.

18499819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6509.

The product of its digits is 186624, while the sum is 49.

The square root of 18499819 is about 4301.1415926472. The cubic root of 18499819 is about 264.4777610980.

The spelling of 18499819 in words is "eighteen million, four hundred ninety-nine thousand, eight hundred nineteen".