229139280 has 140 divisors (see below), whose sum is σ = 798961140. Its totient is φ = 61088256.

The previous prime is 229139257. The next prime is 229139327. The reversal of 229139280 is 82931922.

It can be written as a sum of positive squares in 2 ways, for example, as 55532304 + 173606976 = 7452^2 + 13176^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 27 ways as a sum of consecutive naturals, for example, 56356 + ... + 60284.

Almost surely, 2^229139280 is an apocalyptic number.

229139280 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 229139280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (399480570).

229139280 is an abundant number, since it is smaller than the sum of its proper divisors (569821860).

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

229139280 is an equidigital number, since it uses as much as digits as its factorization.

229139280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3960 (or 3939 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 36.

The square root of 229139280 is about 15137.3471916317. The cubic root of 229139280 is about 611.9273270108.

The spelling of 229139280 in words is "two hundred twenty-nine million, one hundred thirty-nine thousand, two hundred eighty".