18936873 has 6 divisors (see below), whose sum is σ = 27353274. Its totient is φ = 12624576.

The previous prime is 18936829. The next prime is 18936893. The reversal of 18936873 is 37863981.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 13046544 + 5890329 = 3612^2 + 2427^2 .

It is not a de Polignac number, because 18936873 - 2¹⁰ = 18935849 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18936803) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1052040 + ... + 1052057.

It is an arithmetic number, because the mean of its divisors is an integer number (4558879).

Almost surely, 2^18936873 is an apocalyptic number.

It is an amenable number.

18936873 is a deficient number, since it is larger than the sum of its proper divisors (8416401).

18936873 is a wasteful number, since it uses less digits than its factorization.

18936873 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2104103 (or 2104100 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 18936873 is about 4351.6517553683. The cubic root of 18936873 is about 266.5443138356.

The spelling of 18936873 in words is "eighteen million, nine hundred thirty-six thousand, eight hundred seventy-three".