2146405 has 4 divisors (see below), whose sum is σ = 2575692. Its totient is φ = 1717120.

The previous prime is 2146393. The next prime is 2146423. The reversal of 2146405 is 5046412.

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 1674436 + 471969 = 1294^2 + 687^2 .

It is not a de Polignac number, because 2146405 - 2²¹ = 49253 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214636 + ... + 214645.

It is an arithmetic number, because the mean of its divisors is an integer number (643923).

2^2146405 is an apocalyptic number.

It is an amenable number.

2146405 is a deficient number, since it is larger than the sum of its proper divisors (429287).

2146405 is an equidigital number, since it uses as much as digits as its factorization.

2146405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429286.

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 2146405 is about 1465.0614321591. The cubic root of 2146405 is about 128.9943109884.

The spelling of 2146405 in words is "two million, one hundred forty-six thousand, four hundred five".