139899 has 4 divisors (see below), whose sum is σ = 186536. Its totient is φ = 93264.

The previous prime is 139891. The next prime is 139901. The reversal of 139899 is 998931.

139899 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 139899 - 2³ = 139891 is a prime.

It is a D-number.

It is a Duffinian number.

It is a plaindrome in base 16.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139899.

It is not an unprimeable number, because it can be changed into a prime (139891) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23314 + ... + 23319.

It is an arithmetic number, because the mean of its divisors is an integer number (46634).

2¹³⁹⁸⁹⁹ is an apocalyptic number.

139899 is a deficient number, since it is larger than the sum of its proper divisors (46637).

139899 is an equidigital number, since it uses as much as digits as its factorization.

139899 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46636.

The product of its digits is 17496, while the sum is 39.

The square root of 139899 is about 374.0307473992. The cubic root of 139899 is about 51.9124513025.

The spelling of 139899 in words is "one hundred thirty-nine thousand, eight hundred ninety-nine".