1387189 has 2 divisors, whose sum is σ = 1387190. Its totient is φ = 1387188.

The previous prime is 1387163. The next prime is 1387207. The reversal of 1387189 is 9817831.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1340964 + 46225 = 1158^2 + 215^2 .

It is a cyclic number.

It is not a de Polignac number, because 1387189 - 2¹³ = 1378997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1387109) 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, 693594 + 693595.

It is an arithmetic number, because the mean of its divisors is an integer number (693595).

2^1387189 is an apocalyptic number.

It is an amenable number.

1387189 is a deficient number, since it is larger than the sum of its proper divisors (1).

1387189 is an equidigital number, since it uses as much as digits as its factorization.

1387189 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12096, while the sum is 37.

The square root of 1387189 is about 1177.7898793928. The cubic root of 1387189 is about 111.5266212987.

The spelling of 1387189 in words is "one million, three hundred eighty-seven thousand, one hundred eighty-nine".