18537713 has 4 divisors (see below), whose sum is σ = 18617508. Its totient is φ = 18457920.

The previous prime is 18537709. The next prime is 18537719. The reversal of 18537713 is 31773581.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31773581 = 7 ⋅4539083.

It can be written as a sum of positive squares in 2 ways, for example, as 3265249 + 15272464 = 1807^2 + 3908^2 .

It is a cyclic number.

It is not a de Polignac number, because 18537713 - 2² = 18537709 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18537719) 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, 39548 + ... + 40013.

It is an arithmetic number, because the mean of its divisors is an integer number (4654377).

Almost surely, 2^18537713 is an apocalyptic number.

It is an amenable number.

18537713 is a deficient number, since it is larger than the sum of its proper divisors (79795).

18537713 is an equidigital number, since it uses as much as digits as its factorization.

18537713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79794.

The product of its digits is 17640, while the sum is 35.

The square root of 18537713 is about 4305.5444487312. The cubic root of 18537713 is about 264.6582184516.

The spelling of 18537713 in words is "eighteen million, five hundred thirty-seven thousand, seven hundred thirteen".