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2605221 = 32289469
BaseRepresentation
bin1001111100000010100101
311220100200200
421330002211
51131331341
6131501113
731100253
oct11740245
94810620
102605221
11151a383
12a57799
13702a68
144bb5d3
15366db6
hex27c0a5

2605221 has 6 divisors (see below), whose sum is σ = 3763110. Its totient is φ = 1736808.

The previous prime is 2605201. The next prime is 2605231. The reversal of 2605221 is 1225062.

It can be written as a sum of positive squares in only one way, i.e., 2604996 + 225 = 1614^2 + 15^2 .

It is not a de Polignac number, because 2605221 - 25 = 2605189 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2605194 and 2605203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2605201) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 144726 + ... + 144743.

It is an arithmetic number, because the mean of its divisors is an integer number (627185).

22605221 is an apocalyptic number.

It is an amenable number.

2605221 is a deficient number, since it is larger than the sum of its proper divisors (1157889).

2605221 is a wasteful number, since it uses less digits than its factorization.

2605221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289475 (or 289472 counting only the distinct ones).

The product of its (nonzero) digits is 240, while the sum is 18.

The square root of 2605221 is about 1614.0697010972. The cubic root of 2605221 is about 137.5988666359.

The spelling of 2605221 in words is "two million, six hundred five thousand, two hundred twenty-one".

Divisors: 1 3 9 289469 868407 2605221