2149765 has 4 divisors (see below), whose sum is σ = 2579724. Its totient is φ = 1719808.

The previous prime is 2149727. The next prime is 2149781. The reversal of 2149765 is 5679412.

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 933156 + 1216609 = 966^2 + 1103^2 .

It is a cyclic number.

It is not a de Polignac number, because 2149765 - 2¹⁵ = 2116997 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2149765.

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, 214972 + ... + 214981.

It is an arithmetic number, because the mean of its divisors is an integer number (644931).

2^2149765 is an apocalyptic number.

It is an amenable number.

2149765 is a deficient number, since it is larger than the sum of its proper divisors (429959).

2149765 is an equidigital number, since it uses as much as digits as its factorization.

2149765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 429958.

The product of its digits is 15120, while the sum is 34.

The square root of 2149765 is about 1466.2076933368. The cubic root of 2149765 is about 129.0615854809.

The spelling of 2149765 in words is "two million, one hundred forty-nine thousand, seven hundred sixty-five".