2115605 has 4 divisors (see below), whose sum is σ = 2538732. Its totient is φ = 1692480.

The previous prime is 2115571. The next prime is 2115629. The reversal of 2115605 is 5065112.

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 271441 + 1844164 = 521^2 + 1358^2 .

It is not a de Polignac number, because 2115605 - 2¹² = 2111509 is a prime.

It is a Duffinian number.

It is a Curzon 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, 211556 + ... + 211565.

It is an arithmetic number, because the mean of its divisors is an integer number (634683).

2^2115605 is an apocalyptic number.

It is an amenable number.

2115605 is a deficient number, since it is larger than the sum of its proper divisors (423127).

2115605 is an equidigital number, since it uses as much as digits as its factorization.

2115605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 423126.

The product of its (nonzero) digits is 300, while the sum is 20.

The square root of 2115605 is about 1454.5119456367. The cubic root of 2115605 is about 128.3743314599.

The spelling of 2115605 in words is "two million, one hundred fifteen thousand, six hundred five".