47309947 has 2 divisors, whose sum is σ = 47309948. Its totient is φ = 47309946.

The previous prime is 47309893. The next prime is 47309971. The reversal of 47309947 is 74990374.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 47309947 - 2¹⁵ = 47277179 is a prime.

It is not a weakly prime, because it can be changed into another prime (47309447) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23654973 + 23654974.

It is an arithmetic number, because the mean of its divisors is an integer number (23654974).

Almost surely, 2^47309947 is an apocalyptic number.

47309947 is a deficient number, since it is larger than the sum of its proper divisors (1).

47309947 is an equidigital number, since it uses as much as digits as its factorization.

47309947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 190512, while the sum is 43.

The square root of 47309947 is about 6878.2226628687. Note that the first 3 decimals coincide. The cubic root of 47309947 is about 361.6741647474.

The spelling of 47309947 in words is "forty-seven million, three hundred nine thousand, nine hundred forty-seven".