1289879944 has 32 divisors (see below), whose sum is σ = 2489699520. Its totient is φ = 626141376.

The previous prime is 1289879939. The next prime is 1289879963. The reversal of 1289879944 is 4499789821.

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, 46222 + ... + 68674.

It is an arithmetic number, because the mean of its divisors is an integer number (77803110).

Almost surely, 2^1289879944 is an apocalyptic number.

It is an amenable number.

1289879944 is a deficient number, since it is larger than the sum of its proper divisors (1199819576).

1289879944 is a wasteful number, since it uses less digits than its factorization.

1289879944 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22669 (or 22665 counting only the distinct ones).

The product of its digits is 10450944, while the sum is 61.

The square root of 1289879944 is about 35914.8986355245. The cubic root of 1289879944 is about 1088.5534620102.

The spelling of 1289879944 in words is "one billion, two hundred eighty-nine million, eight hundred seventy-nine thousand, nine hundred forty-four".