18912873 has 12 divisors (see below), whose sum is σ = 29334480. Its totient is φ = 10807272.

The previous prime is 18912851. The next prime is 18912893. The reversal of 18912873 is 37821981.

It is not a de Polignac number, because 18912873 - 2⁵ = 18912841 is a prime.

It is a super-2 number, since 2×18912873² = 715393530228258, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18912893) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 64183 + ... + 64476.

It is an arithmetic number, because the mean of its divisors is an integer number (2444540).

Almost surely, 2^18912873 is an apocalyptic number.

It is an amenable number.

18912873 is a deficient number, since it is larger than the sum of its proper divisors (10421607).

18912873 is a wasteful number, since it uses less digits than its factorization.

18912873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 128676 (or 128669 counting only the distinct ones).

The product of its digits is 24192, while the sum is 39.

The square root of 18912873 is about 4348.8933074979. The cubic root of 18912873 is about 266.4316629258.

The spelling of 18912873 in words is "eighteen million, nine hundred twelve thousand, eight hundred seventy-three".