228917639 has 4 divisors (see below), whose sum is σ = 229268856. Its totient is φ = 228566424.

The previous prime is 228917629. The next prime is 228917651. The reversal of 228917639 is 936719822.

It is a happy number.

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

It is a cyclic number.

It is not a de Polignac number, because 228917639 - 2⁸ = 228917383 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 228917593 and 228917602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (228917629) 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, 174629 + ... + 175934.

It is an arithmetic number, because the mean of its divisors is an integer number (57317214).

Almost surely, 2^228917639 is an apocalyptic number.

228917639 is a deficient number, since it is larger than the sum of its proper divisors (351217).

228917639 is an equidigital number, since it uses as much as digits as its factorization.

228917639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 351216.

The product of its digits is 326592, while the sum is 47.

The square root of 228917639 is about 15130.0244216591. The cubic root of 228917639 is about 611.7299624237.

The spelling of 228917639 in words is "two hundred twenty-eight million, nine hundred seventeen thousand, six hundred thirty-nine".