1881489 has 4 divisors (see below), whose sum is σ = 2508656. Its totient is φ = 1254324.

The previous prime is 1881479. The next prime is 1881493. The reversal of 1881489 is 9841881.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 1881489 - 2¹³ = 1873297 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1881419) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 313579 + ... + 313584.

It is an arithmetic number, because the mean of its divisors is an integer number (627164).

2^1881489 is an apocalyptic number.

It is an amenable number.

1881489 is a deficient number, since it is larger than the sum of its proper divisors (627167).

1881489 is an equidigital number, since it uses as much as digits as its factorization.

1881489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627166.

The product of its digits is 18432, while the sum is 39.

The square root of 1881489 is about 1371.6737950402. The cubic root of 1881489 is about 123.4526910429.

The spelling of 1881489 in words is "one million, eight hundred eighty-one thousand, four hundred eighty-nine".