2139065 has 4 divisors (see below), whose sum is σ = 2566884. Its totient is φ = 1711248.

The previous prime is 2139047. The next prime is 2139091. The reversal of 2139065 is 5609312.

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 215296 + 1923769 = 464^2 + 1387^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2139065 is a prime.

It is a Duffinian 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, 213902 + ... + 213911.

It is an arithmetic number, because the mean of its divisors is an integer number (641721).

2^2139065 is an apocalyptic number.

It is an amenable number.

2139065 is a deficient number, since it is larger than the sum of its proper divisors (427819).

2139065 is an equidigital number, since it uses as much as digits as its factorization.

2139065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427818.

The product of its (nonzero) digits is 1620, while the sum is 26.

The square root of 2139065 is about 1462.5542724973. The cubic root of 2139065 is about 128.8471036709.

The spelling of 2139065 in words is "two million, one hundred thirty-nine thousand, sixty-five".