2117405 has 4 divisors (see below), whose sum is σ = 2540892. Its totient is φ = 1693920.

The previous prime is 2117389. The next prime is 2117411. The reversal of 2117405 is 5047112.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 284089 + 1833316 = 533^2 + 1354^2 .

It is not a de Polignac number, because 2117405 - 2⁴ = 2117389 is a prime.

It is a Duffinian number.

It is a congruent number.

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, 211736 + ... + 211745.

It is an arithmetic number, because the mean of its divisors is an integer number (635223).

2^2117405 is an apocalyptic number.

It is an amenable number.

2117405 is a deficient number, since it is larger than the sum of its proper divisors (423487).

2117405 is an equidigital number, since it uses as much as digits as its factorization.

2117405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423486.

The product of its (nonzero) digits is 280, while the sum is 20.

The square root of 2117405 is about 1455.1305783331. The cubic root of 2117405 is about 128.4107289748.

The spelling of 2117405 in words is "two million, one hundred seventeen thousand, four hundred five".