139644 has 30 divisors (see below), whose sum is σ = 365904. Its totient is φ = 46440.

The previous prime is 139627. The next prime is 139661. The reversal of 139644 is 446931.

139644 is a `hidden beast` number, since 13 + 9 + 644 = 666.

It is an interprime number because it is at equal distance from previous prime (139627) and next prime (139661).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a nude number because it is divisible by every one of its digits.

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 139644.

It is an unprimeable number.

139644 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 109 + ... + 539.

2¹³⁹⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182952).

139644 is an abundant number, since it is smaller than the sum of its proper divisors (226260).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

139644 is a wasteful number, since it uses less digits than its factorization.

139644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 447 (or 436 counting only the distinct ones).

The product of its digits is 2592, while the sum is 27.

The square root of 139644 is about 373.6897108565. The cubic root of 139644 is about 51.8808910908.

The spelling of 139644 in words is "one hundred thirty-nine thousand, six hundred forty-four".