18808157 has 8 divisors (see below), whose sum is σ = 20259360. Its totient is φ = 17403120.

The previous prime is 18808151. The next prime is 18808159. The reversal of 18808157 is 75180881.

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 18808157 - 2⁶ = 18808093 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 18808157.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18808151) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10694 + ... + 12327.

It is an arithmetic number, because the mean of its divisors is an integer number (2532420).

Almost surely, 2^18808157 is an apocalyptic number.

It is an amenable number.

18808157 is a deficient number, since it is larger than the sum of its proper divisors (1451203).

18808157 is a wasteful number, since it uses less digits than its factorization.

18808157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23083.

The product of its (nonzero) digits is 17920, while the sum is 38.

The square root of 18808157 is about 4336.8372116094. The cubic root of 18808157 is about 265.9390300648.

The spelling of 18808157 in words is "eighteen million, eight hundred eight thousand, one hundred fifty-seven".