18440219 has 12 divisors (see below), whose sum is σ = 21546000. Its totient is φ = 15735888.

The previous prime is 18440179. The next prime is 18440231. The reversal of 18440219 is 91204481.

It is not a de Polignac number, because 18440219 - 2⁸ = 18439963 is a prime.

It is a super-2 number, since 2×18440219² = 680083353535922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 18440191 and 18440200.

It is not an unprimeable number, because it can be changed into a prime (18440269) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12482 + ... + 13880.

It is an arithmetic number, because the mean of its divisors is an integer number (1795500).

Almost surely, 2^18440219 is an apocalyptic number.

18440219 is a deficient number, since it is larger than the sum of its proper divisors (3105781).

18440219 is a wasteful number, since it uses less digits than its factorization.

18440219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1682 (or 1675 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 29.

The square root of 18440219 is about 4294.2076102583. The cubic root of 18440219 is about 264.1934370112.

The spelling of 18440219 in words is "eighteen million, four hundred forty thousand, two hundred nineteen".