18955000 has 80 divisors (see below), whose sum is σ = 47234880. Its totient is φ = 7104000.

The previous prime is 18954979. The next prime is 18955003. The reversal of 18955000 is 55981.

It is a self number, because there is not a number n which added to its sum of digits gives 18955000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18955003) 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, 84889 + ... + 85111.

It is an arithmetic number, because the mean of its divisors is an integer number (590436).

Almost surely, 2^18955000 is an apocalyptic number.

18955000 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 18955000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23617440).

18955000 is an abundant number, since it is smaller than the sum of its proper divisors (28279880).

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

18955000 is a wasteful number, since it uses less digits than its factorization.

18955000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 266 (or 247 counting only the distinct ones).

The product of its (nonzero) digits is 1800, while the sum is 28.

The square root of 18955000 is about 4353.7340295429. The cubic root of 18955000 is about 266.6293350518.

The spelling of 18955000 in words is "eighteen million, nine hundred fifty-five thousand".