18438157 has 8 divisors (see below), whose sum is σ = 19370880. Its totient is φ = 17516400.

The previous prime is 18438143. The next prime is 18438163. The reversal of 18438157 is 75183481.

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

It is a cyclic number.

It is not a de Polignac number, because 18438157 - 2⁷ = 18438029 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 (18438107) 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, 819 + ... + 6127.

It is an arithmetic number, because the mean of its divisors is an integer number (2421360).

Almost surely, 2^18438157 is an apocalyptic number.

It is an amenable number.

18438157 is a deficient number, since it is larger than the sum of its proper divisors (932723).

18438157 is a wasteful number, since it uses less digits than its factorization.

18438157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5483.

The product of its digits is 26880, while the sum is 37.

The square root of 18438157 is about 4293.9675126857. The cubic root of 18438157 is about 264.1835892039.

It can be divided in two parts, 1843 and 8157, that added together give a 4-th power (10000 = 10⁴).

The spelling of 18438157 in words is "eighteen million, four hundred thirty-eight thousand, one hundred fifty-seven".