139780 has 24 divisors (see below), whose sum is σ = 304920. Its totient is φ = 53760.

The previous prime is 139759. The next prime is 139787. The reversal of 139780 is 87931.

It can be written as a sum of positive squares in 4 ways, for example, as 28224 + 111556 = 168^2 + 334^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (139787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 460 + ... + 700.

It is an arithmetic number, because the mean of its divisors is an integer number (12705).

2¹³⁹⁷⁸⁰ is an apocalyptic number.

139780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 139780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (152460).

139780 is an abundant number, since it is smaller than the sum of its proper divisors (165140).

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

139780 is a wasteful number, since it uses less digits than its factorization.

139780 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279 (or 277 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 139780 is about 373.8716357254. The cubic root of 139780 is about 51.8977279805.

It can be divided in two parts, 139 and 780, that added together give a palindrome (919).

The spelling of 139780 in words is "one hundred thirty-nine thousand, seven hundred eighty".