138799669 has 8 divisors (see below), whose sum is σ = 140114520. Its totient is φ = 137491200.

The previous prime is 138799649. The next prime is 138799673. The reversal of 138799669 is 966997831.

It can be written as a sum of positive squares in 4 ways, for example, as 25100100 + 113699569 = 5010^2 + 10663^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 138799669 - 2¹¹ = 138797621 is a prime.

It is a super-2 number, since 2×138799669² = 38530696229019122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (138799649) 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 7 ways as a sum of consecutive naturals, for example, 49497 + ... + 52225.

It is an arithmetic number, because the mean of its divisors is an integer number (17514315).

Almost surely, 2^138799669 is an apocalyptic number.

It is an amenable number.

138799669 is a deficient number, since it is larger than the sum of its proper divisors (1314851).

138799669 is a wasteful number, since it uses less digits than its factorization.

138799669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3191.

The product of its digits is 4408992, while the sum is 58.

The square root of 138799669 is about 11781.3271323735. The cubic root of 138799669 is about 517.7611697968.

The spelling of 138799669 in words is "one hundred thirty-eight million, seven hundred ninety-nine thousand, six hundred sixty-nine".