225621402 has 8 divisors (see below), whose sum is σ = 451242816. Its totient is φ = 75207132.

The previous prime is 225621391. The next prime is 225621419. The reversal of 225621402 is 204126522.

It is a happy number.

225621402 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

225621402 is an admirable number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 18801778 + ... + 18801789.

It is an arithmetic number, because the mean of its divisors is an integer number (56405352).

Almost surely, 2^225621402 is an apocalyptic number.

225621402 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

225621402 is a wasteful number, since it uses less digits than its factorization.

225621402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37603572.

The product of its (nonzero) digits is 1920, while the sum is 24.

The square root of 225621402 is about 15020.6991182168. The cubic root of 225621402 is about 608.7796096950.

Adding to 225621402 its reverse (204126522), we get a palindrome (429747924).

The spelling of 225621402 in words is "two hundred twenty-five million, six hundred twenty-one thousand, four hundred two".