2148865 has 4 divisors (see below), whose sum is σ = 2578644. Its totient is φ = 1719088.

The previous prime is 2148863. The next prime is 2148869. The reversal of 2148865 is 5688412.

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 1557504 + 591361 = 1248^2 + 769^2 .

It is a cyclic number.

It is not a de Polignac number, because 2148865 - 2¹ = 2148863 is a prime.

It is an Ulam number.

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 2148865.

It is not an unprimeable number, because it can be changed into a prime (2148863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 214882 + ... + 214891.

It is an arithmetic number, because the mean of its divisors is an integer number (644661).

2^2148865 is an apocalyptic number.

It is an amenable number.

2148865 is a deficient number, since it is larger than the sum of its proper divisors (429779).

2148865 is an equidigital number, since it uses as much as digits as its factorization.

2148865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429778.

The product of its digits is 15360, while the sum is 34.

The square root of 2148865 is about 1465.9007469812. The cubic root of 2148865 is about 129.0435724050.

The spelling of 2148865 in words is "two million, one hundred forty-eight thousand, eight hundred sixty-five".