18949685 has 4 divisors (see below), whose sum is σ = 22739628. Its totient is φ = 15159744.

The previous prime is 18949681. The next prime is 18949717. The reversal of 18949685 is 58694981.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58694981 = 461 ⋅127321.

It can be written as a sum of positive squares in 2 ways, for example, as 8145316 + 10804369 = 2854^2 + 3287^2 .

It is a cyclic number.

It is not a de Polignac number, because 18949685 - 2² = 18949681 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18949681) 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, 1894964 + ... + 1894973.

It is an arithmetic number, because the mean of its divisors is an integer number (5684907).

Almost surely, 2^18949685 is an apocalyptic number.

It is an amenable number.

18949685 is a deficient number, since it is larger than the sum of its proper divisors (3789943).

18949685 is an equidigital number, since it uses as much as digits as its factorization.

18949685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3789942.

The product of its digits is 622080, while the sum is 50.

The square root of 18949685 is about 4353.1235911699. The cubic root of 18949685 is about 266.6044116826.

The spelling of 18949685 in words is "eighteen million, nine hundred forty-nine thousand, six hundred eighty-five".