18816137 has 4 divisors (see below), whose sum is σ = 19806480. Its totient is φ = 17825796.

The previous prime is 18816131. The next prime is 18816173. The reversal of 18816137 is 73161881.

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.

It is a cyclic number.

It is not a de Polignac number, because 18816137 - 2⁶ = 18816073 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18816097 and 18816106.

It is not an unprimeable number, because it can be changed into a prime (18816131) 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, 495143 + ... + 495180.

It is an arithmetic number, because the mean of its divisors is an integer number (4951620).

Almost surely, 2^18816137 is an apocalyptic number.

It is an amenable number.

18816137 is a deficient number, since it is larger than the sum of its proper divisors (990343).

18816137 is an equidigital number, since it uses as much as digits as its factorization.

18816137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 990342.

The product of its digits is 8064, while the sum is 35.

The square root of 18816137 is about 4337.7571393521. The cubic root of 18816137 is about 265.9766359715.

The spelling of 18816137 in words is "eighteen million, eight hundred sixteen thousand, one hundred thirty-seven".