19855000 has 120 divisors (see below), whose sum is σ = 53560980. Its totient is φ = 6840000.

The previous prime is 19854983. The next prime is 19855007. The reversal of 19855000 is 55891.

It is a self number, because there is not a number n which added to its sum of digits gives 19855000.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19855007) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 1044991 + ... + 1045009.

Almost surely, 2^19855000 is an apocalyptic number.

19855000 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 19855000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26780490).

19855000 is an abundant number, since it is smaller than the sum of its proper divisors (33705980).

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

19855000 is a wasteful number, since it uses less digits than its factorization.

19855000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 75 (or 37 counting only the distinct ones).

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

The square root of 19855000 is about 4455.8949718323. The cubic root of 19855000 is about 270.7841856906.

It can be divided in two parts, 198 and 55000, that multiplied together give a square (10890000 = 3300²).

The spelling of 19855000 in words is "nineteen million, eight hundred fifty-five thousand".