163421800 has 48 divisors (see below), whose sum is σ = 384266700. Its totient is φ = 64627200.

The previous prime is 163421779. The next prime is 163421807. The reversal of 163421800 is 8124361.

It can be written as a sum of positive squares in 6 ways, for example, as 44916804 + 118504996 = 6702^2 + 10886^2 .

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 (163421807) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13210 + ... + 22390.

Almost surely, 2^163421800 is an apocalyptic number.

163421800 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 163421800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (192133350).

163421800 is an abundant number, since it is smaller than the sum of its proper divisors (220844900).

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

163421800 is a wasteful number, since it uses less digits than its factorization.

163421800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9286 (or 9277 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 25.

The square root of 163421800 is about 12783.6536248445. The cubic root of 163421800 is about 546.7263385850.

The spelling of 163421800 in words is "one hundred sixty-three million, four hundred twenty-one thousand, eight hundred".