2047861 has 4 divisors (see below), whose sum is σ = 2055532. Its totient is φ = 2040192.

The previous prime is 2047841. The next prime is 2047879. The reversal of 2047861 is 1687402.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1687402 = 2 ⋅843701.

It can be written as a sum of positive squares in 2 ways, for example, as 342225 + 1705636 = 585^2 + 1306^2 .

It is a cyclic number.

It is not a de Polignac number, because 2047861 - 2⁷ = 2047733 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 (2047811) 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, 3420 + ... + 3973.

It is an arithmetic number, because the mean of its divisors is an integer number (513883).

2^2047861 is an apocalyptic number.

It is an amenable number.

2047861 is a deficient number, since it is larger than the sum of its proper divisors (7671).

2047861 is an equidigital number, since it uses as much as digits as its factorization.

2047861 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7670.

The product of its (nonzero) digits is 2688, while the sum is 28.

The square root of 2047861 is about 1431.0349401744. The cubic root of 2047861 is about 126.9892110619.

The spelling of 2047861 in words is "two million, forty-seven thousand, eight hundred sixty-one".