1872889 has 2 divisors, whose sum is σ = 1872890. Its totient is φ = 1872888.

The previous prime is 1872859. The next prime is 1872911. The reversal of 1872889 is 9882781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1836025 + 36864 = 1355^2 + 192^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1872889 is a prime.

1872889 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1872859) 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 as a sum of consecutive naturals, namely, 936444 + 936445.

It is an arithmetic number, because the mean of its divisors is an integer number (936445).

2^1872889 is an apocalyptic number.

It is an amenable number.

1872889 is a deficient number, since it is larger than the sum of its proper divisors (1).

1872889 is an equidigital number, since it uses as much as digits as its factorization.

1872889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 64512, while the sum is 43.

The square root of 1872889 is about 1368.5353484657. The cubic root of 1872889 is about 123.2643092389.

The spelling of 1872889 in words is "one million, eight hundred seventy-two thousand, eight hundred eighty-nine".