18006157 has 8 divisors (see below), whose sum is σ = 19424384. Its totient is φ = 16592688.

The previous prime is 18006137. The next prime is 18006193. The reversal of 18006157 is 75160081.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-18006157 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 (18006127) 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, 13168 + ... + 14470.

It is an arithmetic number, because the mean of its divisors is an integer number (2428048).

Almost surely, 2^18006157 is an apocalyptic number.

It is an amenable number.

18006157 is a deficient number, since it is larger than the sum of its proper divisors (1418227).

18006157 is a wasteful number, since it uses less digits than its factorization.

18006157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2379.

The product of its (nonzero) digits is 1680, while the sum is 28.

The square root of 18006157 is about 4243.3662344888. The cubic root of 18006157 is about 262.1040173196.

The spelling of 18006157 in words is "eighteen million, six thousand, one hundred fifty-seven".