2139965 has 4 divisors (see below), whose sum is σ = 2567964. Its totient is φ = 1711968.

The previous prime is 2139959. The next prime is 2139967. The reversal of 2139965 is 5699312.

2139965 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 241081 + 1898884 = 491^2 + 1378^2 .

It is a cyclic number.

It is not a de Polignac number, because 2139965 - 2¹⁴ = 2123581 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2139967) by changing a digit.

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, 213992 + ... + 214001.

It is an arithmetic number, because the mean of its divisors is an integer number (641991).

2^2139965 is an apocalyptic number.

It is an amenable number.

2139965 is a deficient number, since it is larger than the sum of its proper divisors (427999).

2139965 is an equidigital number, since it uses as much as digits as its factorization.

2139965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 427998.

The product of its digits is 14580, while the sum is 35.

The square root of 2139965 is about 1462.8619210301. The cubic root of 2139965 is about 128.8651717106.

The spelling of 2139965 in words is "two million, one hundred thirty-nine thousand, nine hundred sixty-five".