18157093 has 4 divisors (see below), whose sum is σ = 18165760. Its totient is φ = 18148428.

The previous prime is 18157081. The next prime is 18157099. The reversal of 18157093 is 39075181.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 18157093 - 2¹³ = 18148901 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 (18157099) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 988 + ... + 6106.

It is an arithmetic number, because the mean of its divisors is an integer number (4541440).

Almost surely, 2^18157093 is an apocalyptic number.

It is an amenable number.

18157093 is a deficient number, since it is larger than the sum of its proper divisors (8667).

18157093 is an equidigital number, since it uses as much as digits as its factorization.

18157093 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8666.

The product of its (nonzero) digits is 7560, while the sum is 34.

The square root of 18157093 is about 4261.1140562064. The cubic root of 18157093 is about 262.8343398140.

The spelling of 18157093 in words is "eighteen million, one hundred fifty-seven thousand, ninety-three".