138892989 has 8 divisors (see below), whose sum is σ = 191164672. Its totient is φ = 89608320.

The previous prime is 138892987. The next prime is 138892993. The reversal of 138892989 is 989298831.

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

It is not a de Polignac number, because 138892989 - 2¹ = 138892987 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138892987) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 746644 + ... + 746829.

It is an arithmetic number, because the mean of its divisors is an integer number (23895584).

Almost surely, 2^138892989 is an apocalyptic number.

It is an amenable number.

138892989 is a deficient number, since it is larger than the sum of its proper divisors (52271683).

138892989 is a wasteful number, since it uses less digits than its factorization.

138892989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1493507.

The product of its digits is 2239488, while the sum is 57.

The square root of 138892989 is about 11785.2869714742. The cubic root of 138892989 is about 517.8771802749.

The spelling of 138892989 in words is "one hundred thirty-eight million, eight hundred ninety-two thousand, nine hundred eighty-nine".