1005139989 has 96 divisors (see below), whose sum is σ = 1794816000. Its totient is φ = 554063328.

The previous prime is 1005139987. The next prime is 1005139991. The reversal of 1005139989 is 9899315001.

It is an interprime number because it is at equal distance from previous prime (1005139987) and next prime (1005139991).

It is not a de Polignac number, because 1005139989 - 2¹ = 1005139987 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1005139987) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 6166422 + ... + 6166584.

It is an arithmetic number, because the mean of its divisors is an integer number (18696000).

Almost surely, 2^1005139989 is an apocalyptic number.

It is an amenable number.

1005139989 is a deficient number, since it is larger than the sum of its proper divisors (789676011).

1005139989 is a wasteful number, since it uses less digits than its factorization.

1005139989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 324 (or 311 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 45.

The square root of 1005139989 is about 31703.9427989643. The cubic root of 1005139989 is about 1001.7104025220.

The spelling of 1005139989 in words is "one billion, five million, one hundred thirty-nine thousand, nine hundred eighty-nine".