228388397 has 4 divisors (see below), whose sum is σ = 230522976. Its totient is φ = 226253820.

The previous prime is 228388373. The next prime is 228388403. The reversal of 228388397 is 793883822.

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 not a de Polignac number, because 228388397 - 2⁶ = 228388333 is a prime.

It is a super-2 number, since 2×228388397² = 104322519768459218, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228388337) 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, 1067129 + ... + 1067342.

It is an arithmetic number, because the mean of its divisors is an integer number (57630744).

Almost surely, 2^228388397 is an apocalyptic number.

It is an amenable number.

228388397 is a deficient number, since it is larger than the sum of its proper divisors (2134579).

228388397 is a wasteful number, since it uses less digits than its factorization.

228388397 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2134578.

The product of its digits is 1161216, while the sum is 50.

The square root of 228388397 is about 15112.5245078379. The cubic root of 228388397 is about 611.2581726429.

The spelling of 228388397 in words is "two hundred twenty-eight million, three hundred eighty-eight thousand, three hundred ninety-seven".