18157005 has 48 divisors (see below), whose sum is σ = 33561216. Its totient is φ = 9060480.

The previous prime is 18157001. The next prime is 18157019. The reversal of 18157005 is 50075181.

It is not a de Polignac number, because 18157005 - 2² = 18157001 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 18157005.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18157001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 54690 + ... + 55020.

It is an arithmetic number, because the mean of its divisors is an integer number (699192).

Almost surely, 2^18157005 is an apocalyptic number.

18157005 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18157005 is a deficient number, since it is larger than the sum of its proper divisors (15404211).

18157005 is a wasteful number, since it uses less digits than its factorization.

18157005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418 (or 415 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 27.

The square root of 18157005 is about 4261.1037302558. The cubic root of 18157005 is about 262.8339151965.

The spelling of 18157005 in words is "eighteen million, one hundred fifty-seven thousand, five".