18249619 has 4 divisors (see below), whose sum is σ = 19323144. Its totient is φ = 17176096.

The previous prime is 18249617. The next prime is 18249659. The reversal of 18249619 is 91694281.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 18249619 - 2¹ = 18249617 is a prime.

It is a super-2 number, since 2×18249619² = 666097187290322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18249611) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 536737 + ... + 536770.

It is an arithmetic number, because the mean of its divisors is an integer number (4830786).

Almost surely, 2^18249619 is an apocalyptic number.

18249619 is a deficient number, since it is larger than the sum of its proper divisors (1073525).

18249619 is a wasteful number, since it uses less digits than its factorization.

18249619 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1073524.

The product of its digits is 31104, while the sum is 40.

The square root of 18249619 is about 4271.9572797489. The cubic root of 18249619 is about 263.2800392425.

The spelling of 18249619 in words is "eighteen million, two hundred forty-nine thousand, six hundred nineteen".