18718157 has 8 divisors (see below), whose sum is σ = 18957120. Its totient is φ = 18480960.

The previous prime is 18718127. The next prime is 18718171. The reversal of 18718157 is 75181781.

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 18718157 - 2⁶ = 18718093 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18718157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18718127) 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, 43013 + ... + 43445.

It is an arithmetic number, because the mean of its divisors is an integer number (2369640).

Almost surely, 2^18718157 is an apocalyptic number.

It is an amenable number.

18718157 is a deficient number, since it is larger than the sum of its proper divisors (238963).

18718157 is a wasteful number, since it uses less digits than its factorization.

18718157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 883.

The product of its digits is 15680, while the sum is 38.

The square root of 18718157 is about 4326.4485435516. The cubic root of 18718157 is about 265.5141649149.

The spelling of 18718157 in words is "eighteen million, seven hundred eighteen thousand, one hundred fifty-seven".