18412819 has 4 divisors (see below), whose sum is σ = 19495944. Its totient is φ = 17329696.

The previous prime is 18412817. The next prime is 18412847. The reversal of 18412819 is 91821481.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 91821481 = 181 ⋅507301.

It is a cyclic number.

It is not a de Polignac number, because 18412819 - 2¹ = 18412817 is a prime.

It is a super-2 number, since 2×18412819² = 678063807053522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18412817) 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, 541537 + ... + 541570.

It is an arithmetic number, because the mean of its divisors is an integer number (4873986).

Almost surely, 2^18412819 is an apocalyptic number.

18412819 is a deficient number, since it is larger than the sum of its proper divisors (1083125).

18412819 is a wasteful number, since it uses less digits than its factorization.

18412819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1083124.

The product of its digits is 4608, while the sum is 34.

The square root of 18412819 is about 4291.0160801377. The cubic root of 18412819 is about 264.0625186723.

The spelling of 18412819 in words is "eighteen million, four hundred twelve thousand, eight hundred nineteen".