139820 has 12 divisors (see below), whose sum is σ = 293664. Its totient is φ = 55920.

The previous prime is 139813. The next prime is 139831. The reversal of 139820 is 28931.

It is a plaindrome in base 16.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3476 + ... + 3515.

It is an arithmetic number, because the mean of its divisors is an integer number (24472).

2¹³⁹⁸²⁰ is an apocalyptic number.

139820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

139820 is an abundant number, since it is smaller than the sum of its proper divisors (153844).

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

139820 is a wasteful number, since it uses less digits than its factorization.

139820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7000 (or 6998 counting only the distinct ones).

The product of its (nonzero) digits is 432, while the sum is 23.

The square root of 139820 is about 373.9251261951. The cubic root of 139820 is about 51.9026779283.

Subtracting from 139820 its reverse (28931), we obtain a square (110889 = 333²).

It can be divided in two parts, 139 and 820, that added together give a palindrome (959).

The spelling of 139820 in words is "one hundred thirty-nine thousand, eight hundred twenty".