139406 has 8 divisors (see below), whose sum is σ = 214104. Its totient is φ = 68040.

The previous prime is 139397. The next prime is 139409. The reversal of 139406 is 604931.

139406 is nontrivially palindromic in base 3.

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

It is a Curzon number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 139406.

It is not an unprimeable number, because it can be changed into a prime (139409) 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, 725 + ... + 896.

It is an arithmetic number, because the mean of its divisors is an integer number (26763).

2¹³⁹⁴⁰⁶ is an apocalyptic number.

139406 is a deficient number, since it is larger than the sum of its proper divisors (74698).

139406 is a wasteful number, since it uses less digits than its factorization.

139406 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1666.

The product of its (nonzero) digits is 648, while the sum is 23.

The square root of 139406 is about 373.3711290392. The cubic root of 139406 is about 51.8514002102.

It can be divided in two parts, 139 and 406, that added together give a palindrome (545).

The spelling of 139406 in words is "one hundred thirty-nine thousand, four hundred six".