18690071 has 4 divisors (see below), whose sum is σ = 18871632. Its totient is φ = 18508512.

The previous prime is 18690059. The next prime is 18690097. The reversal of 18690071 is 17009681.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18690071 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18690031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 90626 + ... + 90831.

It is an arithmetic number, because the mean of its divisors is an integer number (4717908).

Almost surely, 2^18690071 is an apocalyptic number.

18690071 is a deficient number, since it is larger than the sum of its proper divisors (181561).

18690071 is a wasteful number, since it uses less digits than its factorization.

18690071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181560.

The product of its (nonzero) digits is 3024, while the sum is 32.

The square root of 18690071 is about 4323.2014757584. The cubic root of 18690071 is about 265.3812999160.

The spelling of 18690071 in words is "eighteen million, six hundred ninety thousand, seventy-one".