18273157 has 4 divisors (see below), whose sum is σ = 20883616. Its totient is φ = 15662700.

The previous prime is 18273133. The next prime is 18273163. The reversal of 18273157 is 75137281.

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.

It is a cyclic number.

It is not a de Polignac number, because 18273157 - 2⁷ = 18273029 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 (18273187) 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, 1305219 + ... + 1305232.

It is an arithmetic number, because the mean of its divisors is an integer number (5220904).

Almost surely, 2^18273157 is an apocalyptic number.

It is an amenable number.

18273157 is a deficient number, since it is larger than the sum of its proper divisors (2610459).

18273157 is an equidigital number, since it uses as much as digits as its factorization.

18273157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2610458.

The product of its digits is 11760, while the sum is 34.

The square root of 18273157 is about 4274.7113352834. The cubic root of 18273157 is about 263.3931817539.

The spelling of 18273157 in words is "eighteen million, two hundred seventy-three thousand, one hundred fifty-seven".