7138409 has 2 divisors, whose sum is σ = 7138410. Its totient is φ = 7138408.

The previous prime is 7138399. The next prime is 7138489. The reversal of 7138409 is 9048317.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5895184 + 1243225 = 2428^2 + 1115^2 .

It is a cyclic number.

It is not a de Polignac number, because 7138409 - 2⁴ = 7138393 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (7138489) 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, 3569204 + 3569205.

It is an arithmetic number, because the mean of its divisors is an integer number (3569205).

Almost surely, 2^7138409 is an apocalyptic number.

It is an amenable number.

7138409 is a deficient number, since it is larger than the sum of its proper divisors (1).

7138409 is an equidigital number, since it uses as much as digits as its factorization.

7138409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6048, while the sum is 32.

The square root of 7138409 is about 2671.7801181984. The cubic root of 7138409 is about 192.5456933190.

The spelling of 7138409 in words is "seven million, one hundred thirty-eight thousand, four hundred nine".