18954219 has 4 divisors (see below), whose sum is σ = 25272296. Its totient is φ = 12636144.

The previous prime is 18954211. The next prime is 18954251. The reversal of 18954219 is 91245981.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91245981 = 3 ⋅30415327.

It is not a de Polignac number, because 18954219 - 2³ = 18954211 is a prime.

It is a super-2 number, since 2×18954219² = 718524835799922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18954211) 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, 3159034 + ... + 3159039.

It is an arithmetic number, because the mean of its divisors is an integer number (6318074).

Almost surely, 2^18954219 is an apocalyptic number.

18954219 is a deficient number, since it is larger than the sum of its proper divisors (6318077).

18954219 is an equidigital number, since it uses as much as digits as its factorization.

18954219 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6318076.

The product of its digits is 25920, while the sum is 39.

The square root of 18954219 is about 4353.6443354964. The cubic root of 18954219 is about 266.6256730388.

The spelling of 18954219 in words is "eighteen million, nine hundred fifty-four thousand, two hundred nineteen".