18914217 has 16 divisors (see below), whose sum is σ = 30517632. Its totient is φ = 10172160.

The previous prime is 18914213. The next prime is 18914239. The reversal of 18914217 is 71241981.

It is not a de Polignac number, because 18914217 - 2² = 18914213 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18914213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26134 + ... + 26847.

It is an arithmetic number, because the mean of its divisors is an integer number (1907352).

Almost surely, 2^18914217 is an apocalyptic number.

18914217 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

18914217 is a deficient number, since it is larger than the sum of its proper divisors (11603415).

18914217 is a wasteful number, since it uses less digits than its factorization.

18914217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53008.

The product of its digits is 4032, while the sum is 33.

The square root of 18914217 is about 4349.0478268237. The cubic root of 18914217 is about 266.4379738949.

The spelling of 18914217 in words is "eighteen million, nine hundred fourteen thousand, two hundred seventeen".