1226878285 has 4 divisors (see below), whose sum is σ = 1472253948. Its totient is φ = 981502624.

The previous prime is 1226878277. The next prime is 1226878309. The reversal of 1226878285 is 5828786221.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5828786221 = 16361 ⋅356261.

It can be written as a sum of positive squares in 2 ways, for example, as 849664201 + 377214084 = 29149^2 + 19422^2 .

It is a cyclic number.

It is not a de Polignac number, because 1226878285 - 2³ = 1226878277 is a prime.

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 a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 122687824 + ... + 122687833.

It is an arithmetic number, because the mean of its divisors is an integer number (368063487).

Almost surely, 2^1226878285 is an apocalyptic number.

It is an amenable number.

1226878285 is a deficient number, since it is larger than the sum of its proper divisors (245375663).

1226878285 is an equidigital number, since it uses as much as digits as its factorization.

1226878285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 245375662.

The product of its digits is 860160, while the sum is 49.

The square root of 1226878285 is about 35026.8223651533. The cubic root of 1226878285 is about 1070.5340697173.

The spelling of 1226878285 in words is "one billion, two hundred twenty-six million, eight hundred seventy-eight thousand, two hundred eighty-five".