2142861 has 16 divisors (see below), whose sum is σ = 3316224. Its totient is φ = 1205424.

The previous prime is 2142857. The next prime is 2142883. The reversal of 2142861 is 1682412.

It is not a de Polignac number, because 2142861 - 2² = 2142857 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2142061) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 646 + ... + 2168.

It is an arithmetic number, because the mean of its divisors is an integer number (207264).

2^2142861 is an apocalyptic number.

2142861 is a gapful number since it is divisible by the number (21) formed by its first and last digit.

It is an amenable number.

2142861 is a deficient number, since it is larger than the sum of its proper divisors (1173363).

2142861 is a wasteful number, since it uses less digits than its factorization.

2142861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1600.

The product of its digits is 768, while the sum is 24.

The square root of 2142861 is about 1463.8514268873. The cubic root of 2142861 is about 128.9232762928.

It can be divided in two parts, 2142 and 861, that added together give a palindrome (3003).

The spelling of 2142861 in words is "two million, one hundred forty-two thousand, eight hundred sixty-one".