2159705 has 16 divisors (see below), whose sum is σ = 2697744. Its totient is φ = 1658880.

The previous prime is 2159701. The next prime is 2159713. The reversal of 2159705 is 5079512.

It can be written as a sum of positive squares in 8 ways, for example, as 274576 + 1885129 = 524^2 + 1373^2 .

It is not a de Polignac number, because 2159705 - 2² = 2159701 is a prime.

It is a Duffinian number.

It is a plaindrome in base 11.

It is not an unprimeable number, because it can be changed into a prime (2159701) 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, 22217 + ... + 22313.

It is an arithmetic number, because the mean of its divisors is an integer number (168609).

2^2159705 is an apocalyptic number.

It is an amenable number.

2159705 is a deficient number, since it is larger than the sum of its proper divisors (538039).

2159705 is an equidigital number, since it uses as much as digits as its factorization.

2159705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 236.

The product of its (nonzero) digits is 3150, while the sum is 29.

The square root of 2159705 is about 1469.5934812049. The cubic root of 2159705 is about 129.2601963355.

The spelling of 2159705 in words is "two million, one hundred fifty-nine thousand, seven hundred five".