139166 has 8 divisors (see below), whose sum is σ = 210600. Its totient is φ = 68968.

The previous prime is 139133. The next prime is 139169. The reversal of 139166 is 661931.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139169) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 65 + ... + 531.

It is an arithmetic number, because the mean of its divisors is an integer number (26325).

2¹³⁹¹⁶⁶ is an apocalyptic number.

139166 is a deficient number, since it is larger than the sum of its proper divisors (71434).

139166 is a wasteful number, since it uses less digits than its factorization.

139166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 618.

The product of its digits is 972, while the sum is 26.

The square root of 139166 is about 373.0495945581. The cubic root of 139166 is about 51.8216274978.

It can be divided in two parts, 1391 and 66, that multiplied together give a triangular number (91806 = T₄₂₈).

The spelling of 139166 in words is "one hundred thirty-nine thousand, one hundred sixty-six".