1880891 has 6 divisors (see below), whose sum is σ = 1913940. Its totient is φ = 1848396.

The previous prime is 1880887. The next prime is 1880899. The reversal of 1880891 is 1980881.

It is not a de Polignac number, because 1880891 - 2² = 1880887 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1880899) 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 5 ways as a sum of consecutive naturals, for example, 4280 + ... + 4698.

It is an arithmetic number, because the mean of its divisors is an integer number (318990).

2^1880891 is an apocalyptic number.

1880891 is a deficient number, since it is larger than the sum of its proper divisors (33049).

1880891 is an frugal number, since it uses more digits than its factorization.

1880891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 553 (or 486 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 35.

The square root of 1880891 is about 1371.4557958607. The cubic root of 1880891 is about 123.4396105285.

The spelling of 1880891 in words is "one million, eight hundred eighty thousand, eight hundred ninety-one".