139621 has 8 divisors (see below), whose sum is σ = 152064. Its totient is φ = 127680.

The previous prime is 139619. The next prime is 139627. The reversal of 139621 is 126931.

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

It is a cyclic number.

It is not a de Polignac number, because 139621 - 2¹ = 139619 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 139592 and 139601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 636 + ... + 826.

It is an arithmetic number, because the mean of its divisors is an integer number (19008).

139621 is a Friedman number, since it can be written as 191*(3^6+2), using all its digits and the basic arithmetic operations.

2¹³⁹⁶²¹ is an apocalyptic number.

It is an amenable number.

139621 is a deficient number, since it is larger than the sum of its proper divisors (12443).

139621 is a wasteful number, since it uses less digits than its factorization.

139621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251.

The product of its digits is 324, while the sum is 22.

The square root of 139621 is about 373.6589353943. The cubic root of 139621 is about 51.8780425950.

The spelling of 139621 in words is "one hundred thirty-nine thousand, six hundred twenty-one".