1870861 has 2 divisors, whose sum is σ = 1870862. Its totient is φ = 1870860.

The previous prime is 1870859. The next prime is 1870879. The reversal of 1870861 is 1680781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1394761 + 476100 = 1181^2 + 690^2 .

It is a cyclic number.

It is not a de Polignac number, because 1870861 - 2¹ = 1870859 is a prime.

Together with 1870859, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1870361) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 935430 + 935431.

It is an arithmetic number, because the mean of its divisors is an integer number (935431).

2^1870861 is an apocalyptic number.

It is an amenable number.

1870861 is a deficient number, since it is larger than the sum of its proper divisors (1).

1870861 is an equidigital number, since it uses as much as digits as its factorization.

1870861 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2688, while the sum is 31.

The square root of 1870861 is about 1367.7942096675. The cubic root of 1870861 is about 123.2198021875.

It can be divided in two parts, 18708 and 61, that added together give a square (18769 = 137²).

The spelling of 1870861 in words is "one million, eight hundred seventy thousand, eight hundred sixty-one".