138705099 has 16 divisors (see below), whose sum is σ = 199406592. Its totient is φ = 85254048.

The previous prime is 138705097. The next prime is 138705101. The reversal of 138705099 is 990507831.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (138705097) and next prime (138705101).

It is not a de Polignac number, because 138705099 - 2¹ = 138705097 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 138705099.

It is not an unprimeable number, because it can be changed into a prime (138705097) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42214 + ... + 45380.

It is an arithmetic number, because the mean of its divisors is an integer number (12462912).

Almost surely, 2^138705099 is an apocalyptic number.

138705099 is a deficient number, since it is larger than the sum of its proper divisors (60701493).

138705099 is a wasteful number, since it uses less digits than its factorization.

138705099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4306.

The product of its (nonzero) digits is 68040, while the sum is 42.

The square root of 138705099 is about 11777.3128938651. The cubic root of 138705099 is about 517.6435523247.

The spelling of 138705099 in words is "one hundred thirty-eight million, seven hundred five thousand, ninety-nine".