18912019 has 8 divisors (see below), whose sum is σ = 21805920. Its totient is φ = 16066176.

The previous prime is 18911999. The next prime is 18912053. The reversal of 18912019 is 91021981.

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

It is not a de Polignac number, because 18912019 - 2⁵ = 18911987 is a prime.

It is a super-2 number, since 2×18912019² = 715328925312722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18912059) 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, 11164 + ... + 12745.

It is an arithmetic number, because the mean of its divisors is an integer number (2725740).

Almost surely, 2^18912019 is an apocalyptic number.

18912019 is a deficient number, since it is larger than the sum of its proper divisors (2893901).

18912019 is a wasteful number, since it uses less digits than its factorization.

18912019 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24029.

The product of its (nonzero) digits is 1296, while the sum is 31.

The square root of 18912019 is about 4348.7951204903. The cubic root of 18912019 is about 266.4276526755.

The spelling of 18912019 in words is "eighteen million, nine hundred twelve thousand, nineteen".