1138409 has 2 divisors, whose sum is σ = 1138410. Its totient is φ = 1138408.

The previous prime is 1138393. The next prime is 1138411. The reversal of 1138409 is 9048311.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 994009 + 144400 = 997^2 + 380^2 .

It is a cyclic number.

It is not a de Polignac number, because 1138409 - 2⁴ = 1138393 is a prime.

Together with 1138411, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1138429) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 569204 + 569205.

It is an arithmetic number, because the mean of its divisors is an integer number (569205).

2^1138409 is an apocalyptic number.

It is an amenable number.

1138409 is a deficient number, since it is larger than the sum of its proper divisors (1).

1138409 is an equidigital number, since it uses as much as digits as its factorization.

1138409 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 864, while the sum is 26.

The square root of 1138409 is about 1066.9625110565. The cubic root of 1138409 is about 104.4157727328.

The spelling of 1138409 in words is "one million, one hundred thirty-eight thousand, four hundred nine".