18499999 has 24 divisors (see below), whose sum is σ = 22818240. Its totient is φ = 14930496.

The previous prime is 18499931. The next prime is 18500017. The reversal of 18499999 is 99999481.

It is not a de Polignac number, because 18499999 - 2²¹ = 16402847 is a prime.

It is a Duffinian number.

18499999 is a modest number, since divided by 9999 gives 1849 as remainder.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18499909) 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 23 ways as a sum of consecutive naturals, for example, 66649 + ... + 66925.

It is an arithmetic number, because the mean of its divisors is an integer number (950760).

Almost surely, 2^18499999 is an apocalyptic number.

18499999 is a deficient number, since it is larger than the sum of its proper divisors (4318241).

18499999 is a wasteful number, since it uses less digits than its factorization.

18499999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 367 (or 360 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 58.

The square root of 18499999 is about 4301.1625172737. The cubic root of 18499999 is about 264.4786188693.

The spelling of 18499999 in words is "eighteen million, four hundred ninety-nine thousand, nine hundred ninety-nine".