228946421 has 4 divisors (see below), whose sum is σ = 249759744. Its totient is φ = 208133100.

The previous prime is 228946313. The next prime is 228946423. The reversal of 228946421 is 124649822.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-228946421 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228946423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10406645 + ... + 10406666.

It is an arithmetic number, because the mean of its divisors is an integer number (62439936).

Almost surely, 2^228946421 is an apocalyptic number.

It is an amenable number.

228946421 is a deficient number, since it is larger than the sum of its proper divisors (20813323).

228946421 is a wasteful number, since it uses less digits than its factorization.

228946421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20813322.

The product of its digits is 55296, while the sum is 38.

The square root of 228946421 is about 15130.9755468707. The cubic root of 228946421 is about 611.7555991170.

It can be divided in two parts, 228 and 946421, that added together give a palindrome (946649).

The spelling of 228946421 in words is "two hundred twenty-eight million, nine hundred forty-six thousand, four hundred twenty-one".