18672337 has 4 divisors (see below), whose sum is σ = 18700596. Its totient is φ = 18644080.

The previous prime is 18672331. The next prime is 18672349. The reversal of 18672337 is 73327681.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 18584721 + 87616 = 4311^2 + 296^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18672337 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18672296 and 18672305.

It is not an unprimeable number, because it can be changed into a prime (18672331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13114 + ... + 14467.

It is an arithmetic number, because the mean of its divisors is an integer number (4675149).

Almost surely, 2^18672337 is an apocalyptic number.

It is an amenable number.

18672337 is a deficient number, since it is larger than the sum of its proper divisors (28259).

18672337 is an equidigital number, since it uses as much as digits as its factorization.

18672337 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28258.

The product of its digits is 42336, while the sum is 37.

The square root of 18672337 is about 4321.1499626835. The cubic root of 18672337 is about 265.2973380223.

The spelling of 18672337 in words is "eighteen million, six hundred seventy-two thousand, three hundred thirty-seven".