228493921 has 8 divisors (see below), whose sum is σ = 229837824. Its totient is φ = 227154240.

The previous prime is 228493913. The next prime is 228493927. The reversal of 228493921 is 129394822.

228493921 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 228493921 - 2³ = 228493913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228493927) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 233385 + ... + 234361.

It is an arithmetic number, because the mean of its divisors is an integer number (28729728).

Almost surely, 2^228493921 is an apocalyptic number.

It is an amenable number.

228493921 is a deficient number, since it is larger than the sum of its proper divisors (1343903).

228493921 is an equidigital number, since it uses as much as digits as its factorization.

228493921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2111.

The product of its digits is 62208, while the sum is 40.

The square root of 228493921 is about 15116.0153810454. The cubic root of 228493921 is about 611.3522995434.

Subtracting from 228493921 its reverse (129394822), we obtain a palindrome (99099099).

The spelling of 228493921 in words is "two hundred twenty-eight million, four hundred ninety-three thousand, nine hundred twenty-one".