139645 has 8 divisors (see below), whose sum is σ = 182880. Its totient is φ = 101520.

The previous prime is 139627. The next prime is 139661. The reversal of 139645 is 546931.

139645 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.

It is not a de Polignac number, because 139645 - 2⁹ = 139133 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1215 + ... + 1324.

It is an arithmetic number, because the mean of its divisors is an integer number (22860).

2¹³⁹⁶⁴⁵ is an apocalyptic number.

It is an amenable number.

139645 is a deficient number, since it is larger than the sum of its proper divisors (43235).

139645 is a wasteful number, since it uses less digits than its factorization.

139645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2555.

The product of its digits is 3240, while the sum is 28.

The square root of 139645 is about 373.6910488626. The cubic root of 139645 is about 51.8810149313.

It can be divided in two parts, 1396 and 45, that added together give a palindrome (1441).

The spelling of 139645 in words is "one hundred thirty-nine thousand, six hundred forty-five".