1872109 has 2 divisors, whose sum is σ = 1872110. Its totient is φ = 1872108.

The previous prime is 1872097. The next prime is 1872113. The reversal of 1872109 is 9012781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1729225 + 142884 = 1315^2 + 378^2 .

It is a cyclic number.

It is not a de Polignac number, because 1872109 - 2⁷ = 1871981 is a prime.

It is a Chen prime.

It is an alternating number because its digits alternate between odd and even.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1872149) 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 as a sum of consecutive naturals, namely, 936054 + 936055.

It is an arithmetic number, because the mean of its divisors is an integer number (936055).

2^1872109 is an apocalyptic number.

It is an amenable number.

1872109 is a deficient number, since it is larger than the sum of its proper divisors (1).

1872109 is an equidigital number, since it uses as much as digits as its factorization.

1872109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1008, while the sum is 28.

The square root of 1872109 is about 1368.2503425909. The cubic root of 1872109 is about 123.2471949462.

It can be divided in two parts, 18 and 72109, that added together give a palindrome (72127).

The spelling of 1872109 in words is "one million, eight hundred seventy-two thousand, one hundred nine".