18786157 has 8 divisors (see below), whose sum is σ = 20271384. Its totient is φ = 17306688.

The previous prime is 18786143. The next prime is 18786161. The reversal of 18786157 is 75168781.

It can be written as a sum of positive squares in 4 ways, for example, as 2937796 + 15848361 = 1714^2 + 3981^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18786157 - 2¹⁵ = 18753389 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 (18786107) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7383 + ... + 9595.

It is an arithmetic number, because the mean of its divisors is an integer number (2533923).

Almost surely, 2^18786157 is an apocalyptic number.

It is an amenable number.

18786157 is a deficient number, since it is larger than the sum of its proper divisors (1485227).

18786157 is a wasteful number, since it uses less digits than its factorization.

18786157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2879.

The product of its digits is 94080, while the sum is 43.

The square root of 18786157 is about 4334.3000588330. The cubic root of 18786157 is about 265.8352995163.

The spelling of 18786157 in words is "eighteen million, seven hundred eighty-six thousand, one hundred fifty-seven".