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138220 = 2256911
BaseRepresentation
bin100001101111101100
321000121021
4201233230
513410340
62543524
71113655
oct415754
9230537
10138220
1194935
1267ba4
134abb4
143852c
152ae4a
hex21bec

138220 has 12 divisors (see below), whose sum is σ = 290304. Its totient is φ = 55280.

The previous prime is 138209. The next prime is 138239. The reversal of 138220 is 22831.

Added to its reverse (22831) it gives a 5-th power (161051 = 115).

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 138194 and 138203.

It is an unprimeable number.

138220 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 3 ways as a sum of consecutive naturals, for example, 3436 + ... + 3475.

It is an arithmetic number, because the mean of its divisors is an integer number (24192).

2138220 is an apocalyptic number.

138220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

138220 is an abundant number, since it is smaller than the sum of its proper divisors (152084).

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

138220 is a wasteful number, since it uses less digits than its factorization.

138220 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6920 (or 6918 counting only the distinct ones).

The product of its (nonzero) digits is 96, while the sum is 16.

The square root of 138220 is about 371.7795045454. The cubic root of 138220 is about 51.7039388818.

Adding to 138220 its reverse (22831), we get a 5-th power (161051 = 115).

The spelling of 138220 in words is "one hundred thirty-eight thousand, two hundred twenty".

Divisors: 1 2 4 5 10 20 6911 13822 27644 34555 69110 138220