47955821 has 8 divisors (see below), whose sum is σ = 50424600. Its totient is φ = 45541440.

The previous prime is 47955779. The next prime is 47955833. The reversal of 47955821 is 12855974.

It can be written as a sum of positive squares in 4 ways, for example, as 196 + 47955625 = 14^2 + 6925^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 47955821 - 2⁶ = 47955757 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (47955881) by changing a digit.

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 in 7 ways as a sum of consecutive naturals, for example, 11786 + ... + 15323.

It is an arithmetic number, because the mean of its divisors is an integer number (6303075).

Almost surely, 2^47955821 is an apocalyptic number.

It is an amenable number.

47955821 is a deficient number, since it is larger than the sum of its proper divisors (2468779).

47955821 is a wasteful number, since it uses less digits than its factorization.

47955821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27199.

The product of its digits is 100800, while the sum is 41.

The square root of 47955821 is about 6925.0141516101. The cubic root of 47955821 is about 363.3125863267.

The spelling of 47955821 in words is "forty-seven million, nine hundred fifty-five thousand, eight hundred twenty-one".