18871137 has 12 divisors (see below), whose sum is σ = 28268240. Its totient is φ = 12580596.

The previous prime is 18871133. The next prime is 18871183. The reversal of 18871137 is 73117881.

It is not a de Polignac number, because 18871137 - 2² = 18871133 is a prime.

It is a super-2 number, since 2×18871137² = 712239623345538, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18871133) 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, 38587 + ... + 39072.

Almost surely, 2^18871137 is an apocalyptic number.

It is an amenable number.

18871137 is a deficient number, since it is larger than the sum of its proper divisors (9397103).

18871137 is an frugal number, since it uses more digits than its factorization.

18871137 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77674 (or 77662 counting only the distinct ones).

The product of its digits is 9408, while the sum is 36.

The square root of 18871137 is about 4344.0921951542. The cubic root of 18871137 is about 266.2355358141.

The spelling of 18871137 in words is "eighteen million, eight hundred seventy-one thousand, one hundred thirty-seven".