228399385 has 4 divisors (see below), whose sum is σ = 274079268. Its totient is φ = 182719504.

The previous prime is 228399373. The next prime is 228399421. The reversal of 228399385 is 583993822.

228399385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 140114569 + 88284816 = 11837^2 + 9396^2 .

It is a cyclic number.

It is not a de Polignac number, because 228399385 - 2⁷ = 228399257 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22839934 + ... + 22839943.

It is an arithmetic number, because the mean of its divisors is an integer number (68519817).

Almost surely, 2^228399385 is an apocalyptic number.

It is an amenable number.

228399385 is a deficient number, since it is larger than the sum of its proper divisors (45679883).

228399385 is an equidigital number, since it uses as much as digits as its factorization.

228399385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 45679882.

The product of its digits is 933120, while the sum is 49.

The square root of 228399385 is about 15112.8880429917. Note that the first 3 decimals coincide. The cubic root of 228399385 is about 611.2679752382.

The spelling of 228399385 in words is "two hundred twenty-eight million, three hundred ninety-nine thousand, three hundred eighty-five".