228376381 has 4 divisors (see below), whose sum is σ = 229106332. Its totient is φ = 227646432.

The previous prime is 228376373. The next prime is 228376391. The reversal of 228376381 is 183673822.

It is the 6170-th star number.

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 98188281 + 130188100 = 9909^2 + 11410^2 .

It is a cyclic number.

It is not a de Polignac number, because 228376381 - 2³ = 228376373 is a prime.

It is a super-2 number, since 2×228376381² = 104311542797314322, 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 (228376331) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 364506 + ... + 365131.

It is an arithmetic number, because the mean of its divisors is an integer number (57276583).

Almost surely, 2^228376381 is an apocalyptic number.

It is an amenable number.

228376381 is a deficient number, since it is larger than the sum of its proper divisors (729951).

228376381 is an equidigital number, since it uses as much as digits as its factorization.

228376381 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 729950.

The product of its digits is 96768, while the sum is 40.

The square root of 228376381 is about 15112.1269515578. The cubic root of 228376381 is about 611.2474525901.

The spelling of 228376381 in words is "two hundred twenty-eight million, three hundred seventy-six thousand, three hundred eighty-one".