1278890253 has 12 divisors (see below), whose sum is σ = 1850307420. Its totient is φ = 851198976.

The previous prime is 1278890203. The next prime is 1278890267. The reversal of 1278890253 is 3520988721.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 426133449 + 852756804 = 20643^2 + 29202^2 .

It is not a de Polignac number, because 1278890253 - 2⁶ = 1278890189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1278890199 and 1278890208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1278890203) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 110388 + ... + 121421.

It is an arithmetic number, because the mean of its divisors is an integer number (154192285).

Almost surely, 2^1278890253 is an apocalyptic number.

It is an amenable number.

1278890253 is a deficient number, since it is larger than the sum of its proper divisors (571417167).

1278890253 is a wasteful number, since it uses less digits than its factorization.

1278890253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 232428 (or 232425 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The square root of 1278890253 is about 35761.5750911506. The cubic root of 1278890253 is about 1085.4531729113.

It can be divided in two parts, 12788 and 90253, that added together give a square (103041 = 321²).

The spelling of 1278890253 in words is "one billion, two hundred seventy-eight million, eight hundred ninety thousand, two hundred fifty-three".