225278399 has 4 divisors (see below), whose sum is σ = 235073136. Its totient is φ = 215483664.

The previous prime is 225278381. The next prime is 225278413. The reversal of 225278399 is 993872522.

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 225278399 - 2¹⁶ = 225212863 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (225278309) 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, 4897334 + ... + 4897379.

It is an arithmetic number, because the mean of its divisors is an integer number (58768284).

Almost surely, 2^225278399 is an apocalyptic number.

225278399 is a deficient number, since it is larger than the sum of its proper divisors (9794737).

225278399 is an equidigital number, since it uses as much as digits as its factorization.

225278399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9794736.

The product of its digits is 544320, while the sum is 47.

The square root of 225278399 is about 15009.2770978485. The cubic root of 225278399 is about 608.4709523058.

The spelling of 225278399 in words is "two hundred twenty-five million, two hundred seventy-eight thousand, three hundred ninety-nine".