47842309 has 2 divisors, whose sum is σ = 47842310. Its totient is φ = 47842308.

The previous prime is 47842259. The next prime is 47842337. The reversal of 47842309 is 90324874.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 26884225 + 20958084 = 5185^2 + 4578^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-47842309 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47842339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23921154 + 23921155.

It is an arithmetic number, because the mean of its divisors is an integer number (23921155).

Almost surely, 2^47842309 is an apocalyptic number.

It is an amenable number.

47842309 is a deficient number, since it is larger than the sum of its proper divisors (1).

47842309 is an equidigital number, since it uses as much as digits as its factorization.

47842309 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 47842309 is about 6916.8135004495. The cubic root of 47842309 is about 363.0257047825.

The spelling of 47842309 in words is "forty-seven million, eight hundred forty-two thousand, three hundred nine".