18706361 has 4 divisors (see below), whose sum is σ = 19309824. Its totient is φ = 18102900.

The previous prime is 18706351. The next prime is 18706367. The reversal of 18706361 is 16360781.

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: 16360781 = 89 ⋅183829.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18706361 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18706367) 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, 301685 + ... + 301746.

It is an arithmetic number, because the mean of its divisors is an integer number (4827456).

Almost surely, 2^18706361 is an apocalyptic number.

It is an amenable number.

18706361 is a deficient number, since it is larger than the sum of its proper divisors (603463).

18706361 is an equidigital number, since it uses as much as digits as its factorization.

18706361 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 603462.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 18706361 is about 4325.0850858683. The cubic root of 18706361 is about 265.4583783821.

The spelling of 18706361 in words is "eighteen million, seven hundred six thousand, three hundred sixty-one".