2129865 has 8 divisors (see below), whose sum is σ = 3407808. Its totient is φ = 1135920.

The previous prime is 2129861. The next prime is 2129867. The reversal of 2129865 is 5689212.

2129865 is nontrivially palindromic in base 11.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2129865 - 2² = 2129861 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

2129865 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (2129861) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70981 + ... + 71010.

It is an arithmetic number, because the mean of its divisors is an integer number (425976).

2^2129865 is an apocalyptic number.

It is an amenable number.

2129865 is a deficient number, since it is larger than the sum of its proper divisors (1277943).

2129865 is a wasteful number, since it uses less digits than its factorization.

2129865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141999.

The product of its digits is 8640, while the sum is 33.

The square root of 2129865 is about 1459.4057009619. The cubic root of 2129865 is about 128.6621167938.

The spelling of 2129865 in words is "two million, one hundred twenty-nine thousand, eight hundred sixty-five".