438158009 has 2 divisors, whose sum is σ = 438158010. Its totient is φ = 438158008.

The previous prime is 438157991. The next prime is 438158023. The reversal of 438158009 is 900851834.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 363283600 + 74874409 = 19060^2 + 8653^2 .

It is a cyclic number.

It is not a de Polignac number, because 438158009 - 2²⁰ = 437109433 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (438158029) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 219079004 + 219079005.

It is an arithmetic number, because the mean of its divisors is an integer number (219079005).

Almost surely, 2^438158009 is an apocalyptic number.

It is an amenable number.

438158009 is a deficient number, since it is larger than the sum of its proper divisors (1).

438158009 is an equidigital number, since it uses as much as digits as its factorization.

438158009 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34560, while the sum is 38.

The square root of 438158009 is about 20932.2241770912. The cubic root of 438158009 is about 759.5276433460.

The spelling of 438158009 in words is "four hundred thirty-eight million, one hundred fifty-eight thousand, nine".