47840638 has 4 divisors (see below), whose sum is σ = 71760960. Its totient is φ = 23920318.

The previous prime is 47840629. The next prime is 47840641. The reversal of 47840638 is 83604874.

It is a semiprime because it is the product of two primes.

It is a self number, because there is not a number n which added to its sum of digits gives 47840638.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 11960158 + ... + 11960161.

It is an arithmetic number, because the mean of its divisors is an integer number (17940240).

Almost surely, 2^47840638 is an apocalyptic number.

47840638 is a deficient number, since it is larger than the sum of its proper divisors (23920322).

47840638 is a wasteful number, since it uses less digits than its factorization.

47840638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23920321.

The product of its (nonzero) digits is 129024, while the sum is 40.

The square root of 47840638 is about 6916.6927067783. The cubic root of 47840638 is about 363.0214782375.

The spelling of 47840638 in words is "forty-seven million, eight hundred forty thousand, six hundred thirty-eight".