228398861 has 4 divisors (see below), whose sum is σ = 228493692. Its totient is φ = 228304032.

The previous prime is 228398857. The next prime is 228398869. The reversal of 228398861 is 168893822.

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 160022500 + 68376361 = 12650^2 + 8269^2 .

It is a cyclic number.

It is not a de Polignac number, because 228398861 - 2² = 228398857 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 (228398869) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 43706 + ... + 48651.

It is an arithmetic number, because the mean of its divisors is an integer number (57123423).

Almost surely, 2^228398861 is an apocalyptic number.

It is an amenable number.

228398861 is a deficient number, since it is larger than the sum of its proper divisors (94831).

228398861 is an equidigital number, since it uses as much as digits as its factorization.

228398861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 94830.

The product of its digits is 331776, while the sum is 47.

The square root of 228398861 is about 15112.8707067850. The cubic root of 228398861 is about 611.2675077754.

The spelling of 228398861 in words is "two hundred twenty-eight million, three hundred ninety-eight thousand, eight hundred sixty-one".