2153705 has 4 divisors (see below), whose sum is σ = 2584452. Its totient is φ = 1722960.

The previous prime is 2153699. The next prime is 2153717. The reversal of 2153705 is 5073512.

2153705 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 1570009 + 583696 = 1253^2 + 764^2 .

It is not a de Polignac number, because 2153705 - 2⁸ = 2153449 is a prime.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 215366 + ... + 215375.

It is an arithmetic number, because the mean of its divisors is an integer number (646113).

2^2153705 is an apocalyptic number.

It is an amenable number.

2153705 is a deficient number, since it is larger than the sum of its proper divisors (430747).

2153705 is an equidigital number, since it uses as much as digits as its factorization.

2153705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 430746.

The product of its (nonzero) digits is 1050, while the sum is 23.

The square root of 2153705 is about 1467.5506805559. The cubic root of 2153705 is about 129.1403835989.

The spelling of 2153705 in words is "two million, one hundred fifty-three thousand, seven hundred five".