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220409 = 723372
BaseRepresentation
bin110101110011111001
3102012100022
4311303321
524023114
64420225
71605410
oct656371
9365308
10220409
11140662
12a7675
1379427
145a477
154548e
hex35cf9

220409 has 12 divisors (see below), whose sum is σ = 270144. Its totient is φ = 175824.

The previous prime is 220403. The next prime is 220411. The reversal of 220409 is 904022.

It is not a de Polignac number, because 220409 - 216 = 154873 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (220403) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 5939 + ... + 5975.

It is an arithmetic number, because the mean of its divisors is an integer number (22512).

2220409 is an apocalyptic number.

It is an amenable number.

220409 is a deficient number, since it is larger than the sum of its proper divisors (49735).

220409 is an equidigital number, since it uses as much as digits as its factorization.

220409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 104 (or 67 counting only the distinct ones).

The product of its (nonzero) digits is 144, while the sum is 17.

The square root of 220409 is about 469.4773689966. The cubic root of 220409 is about 60.4054941423.

Multiplying 220409 by its sum of digits (17), we get a triangular number (3746953 = T2737).

The spelling of 220409 in words is "two hundred twenty thousand, four hundred nine".

Divisors: 1 7 23 37 161 259 851 1369 5957 9583 31487 220409