1278512898 has 16 divisors (see below), whose sum is σ = 2753720256. Its totient is φ = 393388560.

The previous prime is 1278512839. The next prime is 1278512903. The reversal of 1278512898 is 8982158721.

It is a self number, because there is not a number n which added to its sum of digits gives 1278512898.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8195518 + ... + 8195673.

It is an arithmetic number, because the mean of its divisors is an integer number (172107516).

Almost surely, 2^1278512898 is an apocalyptic number.

1278512898 is an abundant number, since it is smaller than the sum of its proper divisors (1475207358).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1278512898 is a wasteful number, since it uses less digits than its factorization.

1278512898 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16391209.

The product of its digits is 645120, while the sum is 51.

The square root of 1278512898 is about 35756.2987178483. The cubic root of 1278512898 is about 1085.3464028754.

The spelling of 1278512898 in words is "one billion, two hundred seventy-eight million, five hundred twelve thousand, eight hundred ninety-eight".