1879861 has 4 divisors (see below), whose sum is σ = 1888300. Its totient is φ = 1871424.

The previous prime is 1879849. The next prime is 1879873. The reversal of 1879861 is 1689781.

1879861 = 969² + 970².

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (1879849) and next prime (1879873).

It can be written as a sum of positive squares in 2 ways, for example, as 940900 + 938961 = 970^2 + 969^2 .

It is a 4-Lehmer number, since φ(1879861) divides (1879861-1)⁴.

It is a cyclic number.

It is not a de Polignac number, because 1879861 - 2¹³ = 1871669 is a prime.

It is a Duffinian number.

1879861 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1879811) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3876 + ... + 4333.

It is an arithmetic number, because the mean of its divisors is an integer number (472075).

2^1879861 is an apocalyptic number.

1879861 is the 970-th centered square number.

It is an amenable number.

1879861 is a deficient number, since it is larger than the sum of its proper divisors (8439).

1879861 is an equidigital number, since it uses as much as digits as its factorization.

1879861 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8438.

The product of its digits is 24192, while the sum is 40.

The square root of 1879861 is about 1371.0802310587. The cubic root of 1879861 is about 123.4170740437.

The spelling of 1879861 in words is "one million, eight hundred seventy-nine thousand, eight hundred sixty-one".