1139129978 has 16 divisors (see below), whose sum is σ = 2000424384. Its totient is φ = 476291040.

The previous prime is 1139129977. The next prime is 1139130017. The reversal of 1139129978 is 8799219311.

It is not an unprimeable number, because it can be changed into a prime (1139129977) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 991700 + ... + 992847.

It is an arithmetic number, because the mean of its divisors is an integer number (125026524).

Almost surely, 2^1139129978 is an apocalyptic number.

1139129978 is a deficient number, since it is larger than the sum of its proper divisors (861294406).

1139129978 is a wasteful number, since it uses less digits than its factorization.

1139129978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1984597.

The product of its digits is 244944, while the sum is 50.

The square root of 1139129978 is about 33750.9996592694. Note that the first 3 decimals coincide. The cubic root of 1139129978 is about 1044.3781097157.

The spelling of 1139129978 in words is "one billion, one hundred thirty-nine million, one hundred twenty-nine thousand, nine hundred seventy-eight".