229721400 has 192 divisors, whose sum is σ = 833280000. Its totient is φ = 58008960.

The previous prime is 229721389. The next prime is 229721407. The reversal of 229721400 is 4127922.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (229721407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 101481 + ... + 103719.

It is an arithmetic number, because the mean of its divisors is an integer number (4340000).

Almost surely, 2^229721400 is an apocalyptic number.

229721400 is a gapful number since it is divisible by the number (20) 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 229721400, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (416640000).

229721400 is an abundant number, since it is smaller than the sum of its proper divisors (603558600).

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

229721400 is a wasteful number, since it uses less digits than its factorization.

229721400 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2283 (or 2268 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 27.

The square root of 229721400 is about 15156.5629349137. The cubic root of 229721400 is about 612.4450818455.

The spelling of 229721400 in words is "two hundred twenty-nine million, seven hundred twenty-one thousand, four hundred".