223398778 has 4 divisors (see below), whose sum is σ = 335098170. Its totient is φ = 111699388.

The previous prime is 223398767. The next prime is 223398779. The reversal of 223398778 is 877893322.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 877893322 = 2 ⋅438946661.

It can be written as a sum of positive squares in only one way, i.e., 213832129 + 9566649 = 14623^2 + 3093^2 .

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (223398779) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 55849693 + ... + 55849696.

Almost surely, 2^223398778 is an apocalyptic number.

223398778 is a deficient number, since it is larger than the sum of its proper divisors (111699392).

223398778 is a wasteful number, since it uses less digits than its factorization.

223398778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111699391.

The product of its digits is 1016064, while the sum is 49.

The square root of 223398778 is about 14946.5306342308. The cubic root of 223398778 is about 606.7739551156.

The spelling of 223398778 in words is "two hundred twenty-three million, three hundred ninety-eight thousand, seven hundred seventy-eight".