1872389 has 2 divisors, whose sum is σ = 1872390. Its totient is φ = 1872388.

The previous prime is 1872337. The next prime is 1872419. The reversal of 1872389 is 9832781.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1677025 + 195364 = 1295^2 + 442^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1872389 is a 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 (1872319) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 936194 + 936195.

It is an arithmetic number, because the mean of its divisors is an integer number (936195).

2^1872389 is an apocalyptic number.

It is an amenable number.

1872389 is a deficient number, since it is larger than the sum of its proper divisors (1).

1872389 is an equidigital number, since it uses as much as digits as its factorization.

1872389 is an evil number, because the sum of its binary digits is even.

The product of its digits is 24192, while the sum is 38.

The square root of 1872389 is about 1368.3526592220. The cubic root of 1872389 is about 123.2533390853.

The spelling of 1872389 in words is "one million, eight hundred seventy-two thousand, three hundred eighty-nine".