18818157 has 8 divisors (see below), whose sum is σ = 25164576. Its totient is φ = 12508592.

The previous prime is 18818131. The next prime is 18818207. The reversal of 18818157 is 75181881.

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 18818157 - 2⁷ = 18818029 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18818257) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7998 + ... + 10079.

It is an arithmetic number, because the mean of its divisors is an integer number (3145572).

Almost surely, 2^18818157 is an apocalyptic number.

It is an amenable number.

18818157 is a deficient number, since it is larger than the sum of its proper divisors (6346419).

18818157 is a wasteful number, since it uses less digits than its factorization.

18818157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18427.

The product of its digits is 17920, while the sum is 39.

The square root of 18818157 is about 4337.9899723259. The cubic root of 18818157 is about 265.9861535748.

The spelling of 18818157 in words is "eighteen million, eight hundred eighteen thousand, one hundred fifty-seven".