1128639994 has 8 divisors (see below), whose sum is σ = 1693113408. Its totient is φ = 564268860.

The previous prime is 1128639949. The next prime is 1128639997. The reversal of 1128639994 is 4999368211.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not an unprimeable number, because it can be changed into a prime (1128639997) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14709 + ... + 49735.

It is an arithmetic number, because the mean of its divisors is an integer number (211639176).

Almost surely, 2^1128639994 is an apocalyptic number.

1128639994 is a deficient number, since it is larger than the sum of its proper divisors (564473414).

1128639994 is a wasteful number, since it uses less digits than its factorization.

1128639994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51140.

The product of its digits is 839808, while the sum is 52.

The square root of 1128639994 is about 33595.2376684553. The cubic root of 1128639994 is about 1041.1624065335.

The spelling of 1128639994 in words is "one billion, one hundred twenty-eight million, six hundred thirty-nine thousand, nine hundred ninety-four".