18514819 has 4 divisors (see below), whose sum is σ = 19603944. Its totient is φ = 17425696.

The previous prime is 18514813. The next prime is 18514823. The reversal of 18514819 is 91841581.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18514819 is a prime.

It is a super-2 number, since 2×18514819² = 685597045205522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18514813) 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, 544537 + ... + 544570.

It is an arithmetic number, because the mean of its divisors is an integer number (4900986).

Almost surely, 2^18514819 is an apocalyptic number.

18514819 is a deficient number, since it is larger than the sum of its proper divisors (1089125).

18514819 is a wasteful number, since it uses less digits than its factorization.

18514819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1089124.

The product of its digits is 11520, while the sum is 37.

The square root of 18514819 is about 4302.8849624409. The cubic root of 18514819 is about 264.5492229626.

It can be divided in two parts, 1851 and 4819, that added together give a triangular number (6670 = T₁₁₅).

The spelling of 18514819 in words is "eighteen million, five hundred fourteen thousand, eight hundred nineteen".