18038157 has 4 divisors (see below), whose sum is σ = 24050880. Its totient is φ = 12025436.

The previous prime is 18038147. The next prime is 18038159. The reversal of 18038157 is 75183081.

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 18038157 - 2⁶ = 18038093 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18038159) 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 3 ways as a sum of consecutive naturals, for example, 3006357 + ... + 3006362.

It is an arithmetic number, because the mean of its divisors is an integer number (6012720).

Almost surely, 2^18038157 is an apocalyptic number.

It is an amenable number.

18038157 is a deficient number, since it is larger than the sum of its proper divisors (6012723).

18038157 is an equidigital number, since it uses as much as digits as its factorization.

18038157 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6012722.

The product of its (nonzero) digits is 6720, while the sum is 33.

The square root of 18038157 is about 4247.1351520760. The cubic root of 18038157 is about 262.2591932202.

The spelling of 18038157 in words is "eighteen million, thirty-eight thousand, one hundred fifty-seven".