18378099 has 12 divisors (see below), whose sum is σ = 26668096. Its totient is φ = 12195792.

The previous prime is 18378091. The next prime is 18378169. The reversal of 18378099 is 99087381.

It is not a de Polignac number, because 18378099 - 2³ = 18378091 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18378091) 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 11 ways as a sum of consecutive naturals, for example, 2572 + ... + 6585.

Almost surely, 2^18378099 is an apocalyptic number.

18378099 is a deficient number, since it is larger than the sum of its proper divisors (8289997).

18378099 is a wasteful number, since it uses less digits than its factorization.

18378099 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9386 (or 9383 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 18378099 is about 4286.9685093315. The cubic root of 18378099 is about 263.8964383748.

The spelling of 18378099 in words is "eighteen million, three hundred seventy-eight thousand, ninety-nine".