47840389 has 2 divisors, whose sum is σ = 47840390. Its totient is φ = 47840388.

The previous prime is 47840357. The next prime is 47840411. The reversal of 47840389 is 98304874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 46471489 + 1368900 = 6817^2 + 1170^2 .

It is a cyclic number.

It is not a de Polignac number, because 47840389 - 2⁵ = 47840357 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (47840339) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 23920194 + 23920195.

It is an arithmetic number, because the mean of its divisors is an integer number (23920195).

Almost surely, 2^47840389 is an apocalyptic number.

It is an amenable number.

47840389 is a deficient number, since it is larger than the sum of its proper divisors (1).

47840389 is an equidigital number, since it uses as much as digits as its factorization.

47840389 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 193536, while the sum is 43.

The square root of 47840389 is about 6916.6747068226. The cubic root of 47840389 is about 363.0208484207.

The spelling of 47840389 in words is "forty-seven million, eight hundred forty thousand, three hundred eighty-nine".