12018819 has 4 divisors (see below), whose sum is σ = 16025096. Its totient is φ = 8012544.

The previous prime is 12018817. The next prime is 12018833. The reversal of 12018819 is 91881021.

12018819 is digitally balanced in base 2 and base 4, because in such bases it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 12018819 - 2¹ = 12018817 is a prime.

It is a super-2 number, since 2×12018819² = 288904020309522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (12018817) 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, 2003134 + ... + 2003139.

It is an arithmetic number, because the mean of its divisors is an integer number (4006274).

Almost surely, 2^12018819 is an apocalyptic number.

12018819 is a deficient number, since it is larger than the sum of its proper divisors (4006277).

12018819 is an equidigital number, since it uses as much as digits as its factorization.

12018819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4006276.

The product of its (nonzero) digits is 1152, while the sum is 30.

The square root of 12018819 is about 3466.8168396960. The cubic root of 12018819 is about 229.0624658765.

The spelling of 12018819 in words is "twelve million, eighteen thousand, eight hundred nineteen".