18240157 has 8 divisors (see below), whose sum is σ = 19678680. Its totient is φ = 16806720.

The previous prime is 18240151. The next prime is 18240161. The reversal of 18240157 is 75104281.

It can be written as a sum of positive squares in 4 ways, for example, as 143641 + 18096516 = 379^2 + 4254^2 .

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 18240157 - 2⁷ = 18240029 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 (18240151) 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, 9819 + ... + 11527.

It is an arithmetic number, because the mean of its divisors is an integer number (2459835).

Almost surely, 2^18240157 is an apocalyptic number.

It is an amenable number.

18240157 is a deficient number, since it is larger than the sum of its proper divisors (1438523).

18240157 is a wasteful number, since it uses less digits than its factorization.

18240157 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2543.

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 18240157 is about 4270.8496812695. The cubic root of 18240157 is about 263.2345298652.

The spelling of 18240157 in words is "eighteen million, two hundred forty thousand, one hundred fifty-seven".