2205405 has 12 divisors (see below), whose sum is σ = 3822780. Its totient is φ = 1176192.

The previous prime is 2205389. The next prime is 2205409. The reversal of 2205405 is 5045022.

It can be written as a sum of positive squares in 2 ways, for example, as 251001 + 1954404 = 501^2 + 1398^2 .

It is not a de Polignac number, because 2205405 - 2⁴ = 2205389 is a prime.

It is a super-2 number, since 2×2205405² = 9727622428050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2205409) 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, 24460 + ... + 24549.

It is an arithmetic number, because the mean of its divisors is an integer number (318565).

2^2205405 is an apocalyptic number.

It is an amenable number.

2205405 is a deficient number, since it is larger than the sum of its proper divisors (1617375).

2205405 is a wasteful number, since it uses less digits than its factorization.

2205405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49020 (or 49017 counting only the distinct ones).

The product of its (nonzero) digits is 400, while the sum is 18.

The square root of 2205405 is about 1485.0606048239. The cubic root of 2205405 is about 130.1655681354.

It can be divided in two parts, 2205 and 405, that multiplied together give a square (893025 = 945²).

The spelling of 2205405 in words is "two million, two hundred five thousand, four hundred five".