2100405 has 16 divisors (see below), whose sum is σ = 3469824. Its totient is φ = 1083840.

The previous prime is 2100403. The next prime is 2100407. The reversal of 2100405 is 5040012.

It is an interprime number because it is at equal distance from previous prime (2100403) and next prime (2100407).

It is not a de Polignac number, because 2100405 - 2¹ = 2100403 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2100403) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1794 + ... + 2723.

It is an arithmetic number, because the mean of its divisors is an integer number (216864).

2^2100405 is an apocalyptic number.

It is an amenable number.

2100405 is a deficient number, since it is larger than the sum of its proper divisors (1369419).

2100405 is a wasteful number, since it uses less digits than its factorization.

2100405 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4556.

The product of its (nonzero) digits is 40, while the sum is 12.

The square root of 2100405 is about 1449.2774061580. The cubic root of 2100405 is about 128.0661482642.

Adding to 2100405 its reverse (5040012), we get a palindrome (7140417).

The spelling of 2100405 in words is "two million, one hundred thousand, four hundred five".