18157550 has 12 divisors (see below), whose sum is σ = 33773136. Its totient is φ = 7263000.

The previous prime is 18157549. The next prime is 18157553. The reversal of 18157550 is 5575181.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18157553) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 181526 + ... + 181625.

It is an arithmetic number, because the mean of its divisors is an integer number (2814428).

Almost surely, 2^18157550 is an apocalyptic number.

18157550 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18157550 is a deficient number, since it is larger than the sum of its proper divisors (15615586).

18157550 is a wasteful number, since it uses less digits than its factorization.

18157550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 363163 (or 363158 counting only the distinct ones).

The product of its (nonzero) digits is 7000, while the sum is 32.

The square root of 18157550 is about 4261.1676803430. The cubic root of 18157550 is about 262.8365449079.

The spelling of 18157550 in words is "eighteen million, one hundred fifty-seven thousand, five hundred fifty".