1278798417 has 12 divisors (see below), whose sum is σ = 1989242164. Its totient is φ = 786952800.

The previous prime is 1278798379. The next prime is 1278798421. The reversal of 1278798417 is 7148978721.

It can be written as a sum of positive squares in 2 ways, for example, as 529736256 + 749062161 = 23016^2 + 27369^2 .

It is not a de Polignac number, because 1278798417 - 2⁸ = 1278798161 is a prime.

It is a super-3 number, since 3×1278798417³ (a number of 28 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (1278798217) 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, 5464834 + ... + 5465067.

Almost surely, 2^1278798417 is an apocalyptic number.

It is an amenable number.

1278798417 is a deficient number, since it is larger than the sum of its proper divisors (710443747).

1278798417 is a wasteful number, since it uses less digits than its factorization.

1278798417 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10929920 (or 10929917 counting only the distinct ones).

The product of its digits is 1580544, while the sum is 54.

The square root of 1278798417 is about 35760.2910642517. The cubic root of 1278798417 is about 1085.4271904724.

The spelling of 1278798417 in words is "one billion, two hundred seventy-eight million, seven hundred ninety-eight thousand, four hundred seventeen".