2135405 has 4 divisors (see below), whose sum is σ = 2562492. Its totient is φ = 1708320.

The previous prime is 2135401. The next prime is 2135407. The reversal of 2135405 is 5045312.

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 885481 + 1249924 = 941^2 + 1118^2 .

It is not a de Polignac number, because 2135405 - 2² = 2135401 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2135401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 213536 + ... + 213545.

It is an arithmetic number, because the mean of its divisors is an integer number (640623).

2^2135405 is an apocalyptic number.

It is an amenable number.

2135405 is a deficient number, since it is larger than the sum of its proper divisors (427087).

2135405 is an equidigital number, since it uses as much as digits as its factorization.

2135405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427086.

The product of its (nonzero) digits is 600, while the sum is 20.

The square root of 2135405 is about 1461.3025011954. The cubic root of 2135405 is about 128.7735747198.

The spelling of 2135405 in words is "two million, one hundred thirty-five thousand, four hundred five".