138709899 has 24 divisors (see below), whose sum is σ = 214069440. Its totient is φ = 86291568.

The previous prime is 138709877. The next prime is 138709933. The reversal of 138709899 is 998907831.

It is not a de Polignac number, because 138709899 - 2¹² = 138705803 is a prime.

It is not an unprimeable number, because it can be changed into a prime (138709199) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 5404 + ... + 17510.

It is an arithmetic number, because the mean of its divisors is an integer number (8919560).

Almost surely, 2^138709899 is an apocalyptic number.

138709899 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

138709899 is a deficient number, since it is larger than the sum of its proper divisors (75359541).

138709899 is a wasteful number, since it uses less digits than its factorization.

138709899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12199 (or 12196 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 54.

The square root of 138709899 is about 11777.5166737305. The cubic root of 138709899 is about 517.6495234111.

The spelling of 138709899 in words is "one hundred thirty-eight million, seven hundred nine thousand, eight hundred ninety-nine".