18157900 has 36 divisors (see below), whose sum is σ = 39794328. Its totient is φ = 7191040.

The previous prime is 18157891. The next prime is 18157927. The reversal of 18157900 is 975181.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9852 + ... + 11548.

It is an arithmetic number, because the mean of its divisors is an integer number (1105398).

Almost surely, 2^18157900 is an apocalyptic number.

18157900 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 18157900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19897164).

18157900 is an abundant number, since it is smaller than the sum of its proper divisors (21636428).

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

18157900 is a wasteful number, since it uses less digits than its factorization.

18157900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1818 (or 1811 counting only the distinct ones).

The product of its (nonzero) digits is 2520, while the sum is 31.

The square root of 18157900 is about 4261.2087487003. The cubic root of 18157900 is about 262.8382336857.

It can be divided in two parts, 181 and 57900, that added together give a square (58081 = 241²).

The spelling of 18157900 in words is "eighteen million, one hundred fifty-seven thousand, nine hundred".