2154605 has 4 divisors (see below), whose sum is σ = 2585532. Its totient is φ = 1723680.

The previous prime is 2154587. The next prime is 2154611. The reversal of 2154605 is 5064512.

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 964324 + 1190281 = 982^2 + 1091^2 .

It is not a de Polignac number, because 2154605 - 2⁶ = 2154541 is a prime.

It is a Duffinian 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, 215456 + ... + 215465.

It is an arithmetic number, because the mean of its divisors is an integer number (646383).

2^2154605 is an apocalyptic number.

It is an amenable number.

2154605 is a deficient number, since it is larger than the sum of its proper divisors (430927).

2154605 is an equidigital number, since it uses as much as digits as its factorization.

2154605 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430926.

The product of its (nonzero) digits is 1200, while the sum is 23.

The square root of 2154605 is about 1467.8572818909. The cubic root of 2154605 is about 129.1583696833.

The spelling of 2154605 in words is "two million, one hundred fifty-four thousand, six hundred five".