18704131 has 4 divisors (see below), whose sum is σ = 19804392. Its totient is φ = 17603872.

The previous prime is 18704117. The next prime is 18704137. The reversal of 18704131 is 13140781.

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

It is a cyclic number.

It is not a de Polignac number, because 18704131 - 2¹⁵ = 18671363 is a prime.

It is a super-2 number, since 2×18704131² = 699689032930322, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18704096 and 18704105.

It is not an unprimeable number, because it can be changed into a prime (18704137) 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, 550105 + ... + 550138.

It is an arithmetic number, because the mean of its divisors is an integer number (4951098).

Almost surely, 2^18704131 is an apocalyptic number.

18704131 is a deficient number, since it is larger than the sum of its proper divisors (1100261).

18704131 is a wasteful number, since it uses less digits than its factorization.

18704131 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1100260.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 18704131 is about 4324.8272797882. The cubic root of 18704131 is about 265.4478294623.

The spelling of 18704131 in words is "eighteen million, seven hundred four thousand, one hundred thirty-one".