139906 has 8 divisors (see below), whose sum is σ = 226044. Its totient is φ = 64560.

The previous prime is 139901. The next prime is 139907. The reversal of 139906 is 609931.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 128881 + 11025 = 359^2 + 105^2 .

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

It is not an unprimeable number, because it can be changed into a prime (139901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2665 + ... + 2716.

2¹³⁹⁹⁰⁶ is an apocalyptic number.

139906 is a deficient number, since it is larger than the sum of its proper divisors (86138).

139906 is a wasteful number, since it uses less digits than its factorization.

139906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5396.

The product of its (nonzero) digits is 1458, while the sum is 28.

The square root of 139906 is about 374.0401048016. The cubic root of 139906 is about 51.9133171203.

It can be divided in two parts, 13 and 9906, that multiplied together give a triangular number (128778 = T₅₀₇).

The spelling of 139906 in words is "one hundred thirty-nine thousand, nine hundred six".