47838821 has 4 divisors (see below), whose sum is σ = 47934432. Its totient is φ = 47743212.

The previous prime is 47838803. The next prime is 47838829. The reversal of 47838821 is 12883874.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 47838821 - 2¹⁸ = 47576677 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47838829) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47051 + ... + 48056.

It is an arithmetic number, because the mean of its divisors is an integer number (11983608).

Almost surely, 2^47838821 is an apocalyptic number.

It is an amenable number.

47838821 is a deficient number, since it is larger than the sum of its proper divisors (95611).

47838821 is an equidigital number, since it uses as much as digits as its factorization.

47838821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95610.

The product of its digits is 86016, while the sum is 41.

The square root of 47838821 is about 6916.5613566280. The cubic root of 47838821 is about 363.0168822956.

The spelling of 47838821 in words is "forty-seven million, eight hundred thirty-eight thousand, eight hundred twenty-one".