1226278798 has 4 divisors (see below), whose sum is σ = 1839418200. Its totient is φ = 613139398.

The previous prime is 1226278793. The next prime is 1226278819. The reversal of 1226278798 is 8978726221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8978726221 = 29 ⋅309611249.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1226278793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 306569698 + ... + 306569701.

It is an arithmetic number, because the mean of its divisors is an integer number (459854550).

Almost surely, 2^1226278798 is an apocalyptic number.

1226278798 is a deficient number, since it is larger than the sum of its proper divisors (613139402).

1226278798 is an equidigital number, since it uses as much as digits as its factorization.

1226278798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 613139401.

The product of its digits is 1354752, while the sum is 52.

The square root of 1226278798 is about 35018.2637776347. The cubic root of 1226278798 is about 1070.3596770267.

The spelling of 1226278798 in words is "one billion, two hundred twenty-six million, two hundred seventy-eight thousand, seven hundred ninety-eight".