1889889 has 4 divisors (see below), whose sum is σ = 2519856. Its totient is φ = 1259924.

The previous prime is 1889831. The next prime is 1889957. The reversal of 1889889 is 9889881.

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 a cyclic number.

It is not a de Polignac number, because 1889889 - 2⁷ = 1889761 is a prime.

It is a D-number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1889819) 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, 314979 + ... + 314984.

It is an arithmetic number, because the mean of its divisors is an integer number (629964).

2^1889889 is an apocalyptic number.

It is an amenable number.

1889889 is a deficient number, since it is larger than the sum of its proper divisors (629967).

1889889 is an equidigital number, since it uses as much as digits as its factorization.

1889889 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629966.

The product of its digits is 331776, while the sum is 51.

The square root of 1889889 is about 1374.7323375843. The cubic root of 1889889 is about 123.6361385095.

The spelling of 1889889 in words is "one million, eight hundred eighty-nine thousand, eight hundred eighty-nine".