2142817 has 4 divisors (see below), whose sum is σ = 2158596. Its totient is φ = 2127040.

The previous prime is 2142793. The next prime is 2142823. The reversal of 2142817 is 7182412.

It is a happy number.

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 1846881 + 295936 = 1359^2 + 544^2 .

It is a cyclic number.

It is not a de Polignac number, because 2142817 - 2¹¹ = 2140769 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 2142791 and 2142800.

It is not an unprimeable number, because it can be changed into a prime (2142857) 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, 7684 + ... + 7957.

It is an arithmetic number, because the mean of its divisors is an integer number (539649).

2^2142817 is an apocalyptic number.

It is an amenable number.

2142817 is a deficient number, since it is larger than the sum of its proper divisors (15779).

2142817 is a wasteful number, since it uses less digits than its factorization.

2142817 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15778.

The product of its digits is 896, while the sum is 25.

The square root of 2142817 is about 1463.8363979626. The cubic root of 2142817 is about 128.9223938801.

The spelling of 2142817 in words is "two million, one hundred forty-two thousand, eight hundred seventeen".