1278902259 has 12 divisors (see below), whose sum is σ = 1890264376. Its totient is φ = 832773312.

The previous prime is 1278902249. The next prime is 1278902267. The reversal of 1278902259 is 9522098721.

It is a happy number.

It is not a de Polignac number, because 1278902259 - 2⁵ = 1278902227 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1278902239) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1651942 + ... + 1652715.

Almost surely, 2^1278902259 is an apocalyptic number.

1278902259 is a deficient number, since it is larger than the sum of its proper divisors (611362117).

1278902259 is a wasteful number, since it uses less digits than its factorization.

1278902259 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3304706 (or 3304703 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 45.

The square root of 1278902259 is about 35761.7429524904. The cubic root of 1278902259 is about 1085.4565695828.

It can be divided in two parts, 1278902 and 259, that added together give a square (1279161 = 1131²).

The spelling of 1278902259 in words is "one billion, two hundred seventy-eight million, nine hundred two thousand, two hundred fifty-nine".