1138609 has 4 divisors (see below), whose sum is σ = 1205604. Its totient is φ = 1071616.

The previous prime is 1138591. The next prime is 1138637. The reversal of 1138609 is 9068311.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9068311 = 7 ⋅1295473.

It can be written as a sum of positive squares in 2 ways, for example, as 378225 + 760384 = 615^2 + 872^2 .

It is a cyclic number.

It is not a de Polignac number, because 1138609 - 2⁹ = 1138097 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1138639) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33472 + ... + 33505.

It is an arithmetic number, because the mean of its divisors is an integer number (301401).

2^1138609 is an apocalyptic number.

It is an amenable number.

1138609 is a deficient number, since it is larger than the sum of its proper divisors (66995).

1138609 is an equidigital number, since it uses as much as digits as its factorization.

1138609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66994.

The product of its (nonzero) digits is 1296, while the sum is 28.

The square root of 1138609 is about 1067.0562309457. The cubic root of 1138609 is about 104.4218870941.

The spelling of 1138609 in words is "one million, one hundred thirty-eight thousand, six hundred nine".