18810819 has 16 divisors (see below), whose sum is σ = 27949600. Its totient is φ = 12503808.

The previous prime is 18810797. The next prime is 18810829. The reversal of 18810819 is 91801881.

It is not a de Polignac number, because 18810819 - 2⁸ = 18810563 is a prime.

It is a super-2 number, since 2×18810819² = 707693822901522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18810829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10887 + ... + 12495.

It is an arithmetic number, because the mean of its divisors is an integer number (1746850).

Almost surely, 2^18810819 is an apocalyptic number.

18810819 is a deficient number, since it is larger than the sum of its proper divisors (9138781).

18810819 is a wasteful number, since it uses less digits than its factorization.

18810819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2051 (or 2045 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 36.

The square root of 18810819 is about 4337.1441064369. The cubic root of 18810819 is about 265.9515759742.

The spelling of 18810819 in words is "eighteen million, eight hundred ten thousand, eight hundred nineteen".