18816819 has 16 divisors (see below), whose sum is σ = 28788480. Its totient is φ = 10709280.

The previous prime is 18816793. The next prime is 18816823. The reversal of 18816819 is 91861881.

It is not a de Polignac number, because 18816819 - 2⁹ = 18816307 is a prime.

It is a super-2 number, since 2×18816819² = 708145354557522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18816839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3984 + ... + 7314.

It is an arithmetic number, because the mean of its divisors is an integer number (1799280).

Almost surely, 2^18816819 is an apocalyptic number.

18816819 is a deficient number, since it is larger than the sum of its proper divisors (9971661).

18816819 is a wasteful number, since it uses less digits than its factorization.

18816819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3610.

The product of its digits is 27648, while the sum is 42.

The square root of 18816819 is about 4337.8357506941. The cubic root of 18816819 is about 265.9798494167.

The spelling of 18816819 in words is "eighteen million, eight hundred sixteen thousand, eight hundred nineteen".