1872289 has 2 divisors, whose sum is σ = 1872290. Its totient is φ = 1872288.

The previous prime is 1872287. The next prime is 1872301. The reversal of 1872289 is 9822781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1868689 + 3600 = 1367^2 + 60^2 .

It is a cyclic number.

It is not a de Polignac number, because 1872289 - 2¹ = 1872287 is a prime.

Together with 1872287, it forms a pair of twin primes.

It is a Chen prime.

It is an Ulam number.

It is a d-powerful number, because it can be written as 1 + 8² + 7⁷ + 2⁵ + 2²⁰ + 8² + 9 .

It is not a weakly prime, because it can be changed into another prime (1872281) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 936144 + 936145.

It is an arithmetic number, because the mean of its divisors is an integer number (936145).

2^1872289 is an apocalyptic number.

It is an amenable number.

1872289 is a deficient number, since it is larger than the sum of its proper divisors (1).

1872289 is an equidigital number, since it uses as much as digits as its factorization.

1872289 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 16128, while the sum is 37.

The square root of 1872289 is about 1368.3161184463. The cubic root of 1872289 is about 123.2511448202.

The spelling of 1872289 in words is "one million, eight hundred seventy-two thousand, two hundred eighty-nine".