18968155 has 8 divisors (see below), whose sum is σ = 22818384. Its totient is φ = 15136800.

The previous prime is 18968153. The next prime is 18968179. The reversal of 18968155 is 55186981.

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

It is not a de Polignac number, because 18968155 - 2¹ = 18968153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18968153) 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 7 ways as a sum of consecutive naturals, for example, 2401 + ... + 6610.

It is an arithmetic number, because the mean of its divisors is an integer number (2852298).

Almost surely, 2^18968155 is an apocalyptic number.

18968155 is a deficient number, since it is larger than the sum of its proper divisors (3850229).

18968155 is an equidigital number, since it uses as much as digits as its factorization.

18968155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9437.

The product of its digits is 86400, while the sum is 43.

The square root of 18968155 is about 4355.2445396326. The cubic root of 18968155 is about 266.6910021194.

The spelling of 18968155 in words is "eighteen million, nine hundred sixty-eight thousand, one hundred fifty-five".