2142865 has 8 divisors (see below), whose sum is σ = 2634408. Its totient is φ = 1672320.

The previous prime is 2142857. The next prime is 2142883. The reversal of 2142865 is 5682412.

It can be written as a sum of positive squares in 4 ways, for example, as 271441 + 1871424 = 521^2 + 1368^2 .

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

It is not a de Polignac number, because 2142865 - 2³ = 2142857 is a prime.

It is a Duffinian number.

2142865 is a lucky number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5022 + ... + 5431.

It is an arithmetic number, because the mean of its divisors is an integer number (329301).

2^2142865 is an apocalyptic number.

It is an amenable number.

2142865 is a deficient number, since it is larger than the sum of its proper divisors (491543).

2142865 is a wasteful number, since it uses less digits than its factorization.

2142865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10499.

The product of its digits is 3840, while the sum is 28.

The square root of 2142865 is about 1463.8527931455. The cubic root of 2142865 is about 128.9233565115.

The spelling of 2142865 in words is "two million, one hundred forty-two thousand, eight hundred sixty-five".