18872137 has 4 divisors (see below), whose sum is σ = 18971136. Its totient is φ = 18773140.

The previous prime is 18872123. The next prime is 18872143. The reversal of 18872137 is 73127881.

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: 73127881 = 2083 ⋅35107.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18872137 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18872096 and 18872105.

It is not an unprimeable number, because it can be changed into a prime (18872437) 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, 49213 + ... + 49594.

It is an arithmetic number, because the mean of its divisors is an integer number (4742784).

Almost surely, 2^18872137 is an apocalyptic number.

It is an amenable number.

18872137 is a deficient number, since it is larger than the sum of its proper divisors (98999).

18872137 is an equidigital number, since it uses as much as digits as its factorization.

18872137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98998.

The product of its digits is 18816, while the sum is 37.

The square root of 18872137 is about 4344.2072924758. The cubic root of 18872137 is about 266.2402384248.

The spelling of 18872137 in words is "eighteen million, eight hundred seventy-two thousand, one hundred thirty-seven".