19830400 has 48 divisors (see below), whose sum is σ = 48995190. Its totient is φ = 7930880.

The previous prime is 19830383. The next prime is 19830401. The reversal of 19830400 is 403891.

It can be written as a sum of positive squares in 3 ways, for example, as 13719616 + 6110784 = 3704^2 + 2472^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (19830401) 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, 102 + ... + 6298.

Almost surely, 2^19830400 is an apocalyptic number.

19830400 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 19830400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24497595).

19830400 is an abundant number, since it is smaller than the sum of its proper divisors (29164790).

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

19830400 is an equidigital number, since it uses as much as digits as its factorization.

19830400 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6221 (or 6204 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 25.

The square root of 19830400 is about 4453.1337280616. The cubic root of 19830400 is about 270.6723071724.

The spelling of 19830400 in words is "nineteen million, eight hundred thirty thousand, four hundred".