139998 has 8 divisors (see below), whose sum is σ = 280008. Its totient is φ = 46664.

The previous prime is 139991. The next prime is 139999. The reversal of 139998 is 899931.

139998 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

139998 is an admirable number.

It is a plaindrome in base 16.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139991) 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, 11661 + ... + 11672.

It is an arithmetic number, because the mean of its divisors is an integer number (35001).

2¹³⁹⁹⁹⁸ is an apocalyptic number.

139998 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139998 is a wasteful number, since it uses less digits than its factorization.

139998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23338.

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

The square root of 139998 is about 374.1630660554. The cubic root of 139998 is about 51.9246937557.

It can be divided in two parts, 13 and 9998, that added together give a triangular number (10011 = T₁₄₁).

The spelling of 139998 in words is "one hundred thirty-nine thousand, nine hundred ninety-eight".