1289994632 has 16 divisors (see below), whose sum is σ = 2447882640. Its totient is φ = 637225936.

The previous prime is 1289994631. The next prime is 1289994647. The reversal of 1289994632 is 2364999821.

It is not an unprimeable number, because it can be changed into a prime (1289994631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 970718 + ... + 972045.

It is an arithmetic number, because the mean of its divisors is an integer number (152992665).

Almost surely, 2^1289994632 is an apocalyptic number.

It is an amenable number.

1289994632 is a deficient number, since it is larger than the sum of its proper divisors (1157888008).

1289994632 is a wasteful number, since it uses less digits than its factorization.

1289994632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1942852 (or 1942848 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 53.

The square root of 1289994632 is about 35916.4952633188. The cubic root of 1289994632 is about 1088.5857234931.

The spelling of 1289994632 in words is "one billion, two hundred eighty-nine million, nine hundred ninety-four thousand, six hundred thirty-two".