1880821 has 4 divisors (see below), whose sum is σ = 1931692. Its totient is φ = 1829952.

The previous prime is 1880819. The next prime is 1880831. The reversal of 1880821 is 1280881.

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 1347921 + 532900 = 1161^2 + 730^2 .

It is a cyclic number.

It is not a de Polignac number, because 1880821 - 2¹ = 1880819 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1880821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1880831) 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, 25380 + ... + 25453.

It is an arithmetic number, because the mean of its divisors is an integer number (482923).

2^1880821 is an apocalyptic number.

It is an amenable number.

1880821 is a deficient number, since it is larger than the sum of its proper divisors (50871).

1880821 is an equidigital number, since it uses as much as digits as its factorization.

1880821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50870.

The product of its (nonzero) digits is 1024, while the sum is 28.

The square root of 1880821 is about 1371.4302752966. The cubic root of 1880821 is about 123.4380791833.

It can be divided in two parts, 1880 and 821, that added together give a triangular number (2701 = T₇₃).

The spelling of 1880821 in words is "one million, eight hundred eighty thousand, eight hundred twenty-one".