1139989 has 2 divisors, whose sum is σ = 1139990. Its totient is φ = 1139988.

The previous prime is 1139959. The next prime is 1139993. The reversal of 1139989 is 9899311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1067089 + 72900 = 1033^2 + 270^2 .

It is a cyclic number.

It is not a de Polignac number, because 1139989 - 2⁷ = 1139861 is a prime.

It is a Chen prime.

1139989 is a lucky number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1139909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569994 + 569995.

It is an arithmetic number, because the mean of its divisors is an integer number (569995).

2^1139989 is an apocalyptic number.

It is an amenable number.

1139989 is a deficient number, since it is larger than the sum of its proper divisors (1).

1139989 is an equidigital number, since it uses as much as digits as its factorization.

1139989 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 40.

The square root of 1139989 is about 1067.7026739687. The cubic root of 1139989 is about 104.4640566846.

It can be divided in two parts, 11 and 39989, that added together give a square (40000 = 200²).

The spelling of 1139989 in words is "one million, one hundred thirty-nine thousand, nine hundred eighty-nine".