138099 has 8 divisors (see below), whose sum is σ = 198352. Its totient is φ = 84960.

The previous prime is 138079. The next prime is 138101. The reversal of 138099 is 990831.

138099 = 97² + 98² + ... + 109².

It is a happy number.

138099 is nontrivially palindromic in base 14.

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

It is not a de Polignac number, because 138099 - 2⁹ = 137587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (138059) 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, 1732 + ... + 1809.

It is an arithmetic number, because the mean of its divisors is an integer number (24794).

2¹³⁸⁰⁹⁹ is an apocalyptic number.

138099 is a deficient number, since it is larger than the sum of its proper divisors (60253).

138099 is a wasteful number, since it uses less digits than its factorization.

138099 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3557.

The product of its (nonzero) digits is 1944, while the sum is 30.

The square root of 138099 is about 371.6167380514. The cubic root of 138099 is about 51.6888469919.

The spelling of 138099 in words is "one hundred thirty-eight thousand, ninety-nine".