1278750138 has 16 divisors (see below), whose sum is σ = 2560887840. Its totient is φ = 425685456.

The previous prime is 1278750119. The next prime is 1278750223. The reversal of 1278750138 is 8310578721.

It is a self number, because there is not a number n which added to its sum of digits gives 1278750138.

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, 136228 + ... + 145311.

It is an arithmetic number, because the mean of its divisors is an integer number (160055490).

Almost surely, 2^1278750138 is an apocalyptic number.

1278750138 is an abundant number, since it is smaller than the sum of its proper divisors (1282137702).

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

1278750138 is a wasteful number, since it uses less digits than its factorization.

1278750138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282301.

The product of its (nonzero) digits is 94080, while the sum is 42.

The square root of 1278750138 is about 35759.6160214284. The cubic root of 1278750138 is about 1085.4135307748.

The spelling of 1278750138 in words is "one billion, two hundred seventy-eight million, seven hundred fifty thousand, one hundred thirty-eight".