2153805 has 16 divisors (see below), whose sum is σ = 3474240. Its totient is φ = 1139328.

The previous prime is 2153797. The next prime is 2153813. The reversal of 2153805 is 5083512.

2153805 = 108² + 109² + ... + 197².

2153805 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (2153797) and next prime (2153813).

It is not a de Polignac number, because 2153805 - 2³ = 2153797 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1569 + ... + 2601.

It is an arithmetic number, because the mean of its divisors is an integer number (217140).

2^2153805 is an apocalyptic number.

It is an amenable number.

2153805 is a deficient number, since it is larger than the sum of its proper divisors (1320435).

2153805 is a wasteful number, since it uses less digits than its factorization.

2153805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1180.

The product of its (nonzero) digits is 1200, while the sum is 24.

The square root of 2153805 is about 1467.5847505340. The cubic root of 2153805 is about 129.1423823002.

The spelling of 2153805 in words is "two million, one hundred fifty-three thousand, eight hundred five".