228518993 has 16 divisors (see below), whose sum is σ = 241103616. Its totient is φ = 216354240.

The previous prime is 228518971. The next prime is 228519001. The reversal of 228518993 is 399815822.

It is a cyclic number.

It is not a de Polignac number, because 228518993 - 2⁶ = 228518929 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (228518903) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 231980 + ... + 232962.

It is an arithmetic number, because the mean of its divisors is an integer number (15068976).

Almost surely, 2^228518993 is an apocalyptic number.

It is an amenable number.

228518993 is a deficient number, since it is larger than the sum of its proper divisors (12584623).

228518993 is a wasteful number, since it uses less digits than its factorization.

228518993 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184.

The product of its digits is 311040, while the sum is 47.

The square root of 228518993 is about 15116.8446773789. The cubic root of 228518993 is about 611.3746593859.

The spelling of 228518993 in words is "two hundred twenty-eight million, five hundred eighteen thousand, nine hundred ninety-three".