18012819 has 8 divisors (see below), whose sum is σ = 26200512. Its totient is φ = 10916840.

The previous prime is 18012793. The next prime is 18012847. The reversal of 18012819 is 91821081.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18012819 - 2⁷ = 18012691 is a prime.

It is a super-2 number, since 2×18012819² = 648923296653522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18012889) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 272889 + ... + 272954.

It is an arithmetic number, because the mean of its divisors is an integer number (3275064).

Almost surely, 2^18012819 is an apocalyptic number.

18012819 is a deficient number, since it is larger than the sum of its proper divisors (8187693).

18012819 is a wasteful number, since it uses less digits than its factorization.

18012819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 545857.

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

The square root of 18012819 is about 4244.1511518795. The cubic root of 18012819 is about 262.1363381467.

The spelling of 18012819 in words is "eighteen million, twelve thousand, eight hundred nineteen".