18057500 has 60 divisors (see below), whose sum is σ = 40936896. Its totient is φ = 6960000.

The previous prime is 18057497. The next prime is 18057503. The reversal of 18057500 is 575081.

It is an interprime number because it is at equal distance from previous prime (18057497) and next prime (18057503).

It is a self number, because there is not a number n which added to its sum of digits gives 18057500.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18057503) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 77384 + ... + 77616.

Almost surely, 2^18057500 is an apocalyptic number.

18057500 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18057500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20468448).

18057500 is an abundant number, since it is smaller than the sum of its proper divisors (22879396).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18057500 is a wasteful number, since it uses less digits than its factorization.

18057500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 288 (or 271 counting only the distinct ones).

The product of its (nonzero) digits is 1400, while the sum is 26.

The square root of 18057500 is about 4249.4117239919. The cubic root of 18057500 is about 262.3529032257.

The spelling of 18057500 in words is "eighteen million, fifty-seven thousand, five hundred".