18899873 has 4 divisors (see below), whose sum is σ = 18915888. Its totient is φ = 18883860.

The previous prime is 18899861. The next prime is 18899897. The reversal of 18899873 is 37899881.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 37899881 = 389 ⋅97429.

It is a cyclic number.

It is not a de Polignac number, because 18899873 - 2²⁰ = 17851297 is a prime.

It is a super-2 number, since 2×18899873² = 714410398832258, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18899843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6083 + ... + 8648.

It is an arithmetic number, because the mean of its divisors is an integer number (4728972).

Almost surely, 2^18899873 is an apocalyptic number.

It is an amenable number.

18899873 is a deficient number, since it is larger than the sum of its proper divisors (16015).

18899873 is a wasteful number, since it uses less digits than its factorization.

18899873 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16014.

The product of its digits is 870912, while the sum is 53.

The square root of 18899873 is about 4347.3984174446. The cubic root of 18899873 is about 266.3706038875.

The spelling of 18899873 in words is "eighteen million, eight hundred ninety-nine thousand, eight hundred seventy-three".