18219345 has 8 divisors (see below), whose sum is σ = 29150976. Its totient is φ = 9716976.

The previous prime is 18219343. The next prime is 18219367. The reversal of 18219345 is 54391281.

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

It is not a de Polignac number, because 18219345 - 2¹ = 18219343 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18219343) 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, 607297 + ... + 607326.

It is an arithmetic number, because the mean of its divisors is an integer number (3643872).

Almost surely, 2^18219345 is an apocalyptic number.

18219345 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18219345 is a deficient number, since it is larger than the sum of its proper divisors (10931631).

18219345 is a wasteful number, since it uses less digits than its factorization.

18219345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1214631.

The product of its digits is 8640, while the sum is 33.

The square root of 18219345 is about 4268.4124683540. The cubic root of 18219345 is about 263.1343749892.

The spelling of 18219345 in words is "eighteen million, two hundred nineteen thousand, three hundred forty-five".