1138649 has 2 divisors, whose sum is σ = 1138650. Its totient is φ = 1138648.

The previous prime is 1138639. The next prime is 1138667. The reversal of 1138649 is 9468311.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 855625 + 283024 = 925^2 + 532^2 .

It is an emirp because it is prime and its reverse (9468311) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1138649 - 2⁸ = 1138393 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1138639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569324 + 569325.

It is an arithmetic number, because the mean of its divisors is an integer number (569325).

2^1138649 is an apocalyptic number.

It is an amenable number.

1138649 is a deficient number, since it is larger than the sum of its proper divisors (1).

1138649 is an equidigital number, since it uses as much as digits as its factorization.

1138649 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 32.

The square root of 1138649 is about 1067.0749739358. The cubic root of 1138649 is about 104.4231098804.

The spelling of 1138649 in words is "one million, one hundred thirty-eight thousand, six hundred forty-nine".