2115405 has 24 divisors (see below), whose sum is σ = 3795480. Its totient is φ = 1088640.

The previous prime is 2115397. The next prime is 2115427. The reversal of 2115405 is 5045112.

It can be written as a sum of positive squares in 4 ways, for example, as 443556 + 1671849 = 666^2 + 1293^2 .

It is not a de Polignac number, because 2115405 - 2³ = 2115397 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 495 + ... + 2115.

It is an arithmetic number, because the mean of its divisors is an integer number (158145).

2^2115405 is an apocalyptic number.

It is an amenable number.

2115405 is a deficient number, since it is larger than the sum of its proper divisors (1680075).

2115405 is a wasteful number, since it uses less digits than its factorization.

2115405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1661 (or 1658 counting only the distinct ones).

The product of its (nonzero) digits is 200, while the sum is 18.

The square root of 2115405 is about 1454.4431924279. The cubic root of 2115405 is about 128.3702860173.

The spelling of 2115405 in words is "two million, one hundred fifteen thousand, four hundred five".