225866639 has 8 divisors (see below), whose sum is σ = 228315120. Its totient is φ = 223425216.

The previous prime is 225866633. The next prime is 225866671. The reversal of 225866639 is 936668522.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 225866639 - 2¹² = 225862543 is a prime.

It is a super-2 number, since 2×225866639² = 102031477226312642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 225866593 and 225866602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225866633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84467 + ... + 87099.

It is an arithmetic number, because the mean of its divisors is an integer number (28539390).

Almost surely, 2^225866639 is an apocalyptic number.

225866639 is a deficient number, since it is larger than the sum of its proper divisors (2448481).

225866639 is a wasteful number, since it uses less digits than its factorization.

225866639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3529.

The product of its digits is 933120, while the sum is 47.

The square root of 225866639 is about 15028.8602029562. The cubic root of 225866639 is about 609.0000988637. Note that the first 4 decimals are identical.

The spelling of 225866639 in words is "two hundred twenty-five million, eight hundred sixty-six thousand, six hundred thirty-nine".