1287159378 has 32 divisors (see below), whose sum is σ = 2662082496. Its totient is φ = 414667968.

The previous prime is 1287159323. The next prime is 1287159407. The reversal of 1287159378 is 8739517821.

1287159378 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 1287159378.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8901 + ... + 51512.

It is an arithmetic number, because the mean of its divisors is an integer number (83190078).

Almost surely, 2^1287159378 is an apocalyptic number.

1287159378 is an abundant number, since it is smaller than the sum of its proper divisors (1374923118).

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

1287159378 is a wasteful number, since it uses less digits than its factorization.

1287159378 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60538.

The product of its digits is 846720, while the sum is 51.

The square root of 1287159378 is about 35877.0034701896. The cubic root of 1287159378 is about 1087.7876113907.

The spelling of 1287159378 in words is "one billion, two hundred eighty-seven million, one hundred fifty-nine thousand, three hundred seventy-eight".