138994765 has 16 divisors (see below), whose sum is σ = 205285248. Its totient is φ = 87978816.

The previous prime is 138994699. The next prime is 138994777. The reversal of 138994765 is 567499831.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 138994765 - 2⁷ = 138994637 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 152287 + ... + 153196.

It is an arithmetic number, because the mean of its divisors is an integer number (12830328).

Almost surely, 2^138994765 is an apocalyptic number.

It is an amenable number.

138994765 is a deficient number, since it is larger than the sum of its proper divisors (66290483).

138994765 is a wasteful number, since it uses less digits than its factorization.

138994765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 305508.

The product of its digits is 1632960, while the sum is 52.

The square root of 138994765 is about 11789.6041070089. The cubic root of 138994765 is about 518.0036435794.

The spelling of 138994765 in words is "one hundred thirty-eight million, nine hundred ninety-four thousand, seven hundred sixty-five".