47925821 has 4 divisors (see below), whose sum is σ = 48070944. Its totient is φ = 47780700.

The previous prime is 47925799. The next prime is 47925869. The reversal of 47925821 is 12852974.

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 a de Polignac number, because none of the positive numbers 2^k-47925821 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 (47925881) 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, 72065 + ... + 72726.

It is an arithmetic number, because the mean of its divisors is an integer number (12017736).

Almost surely, 2^47925821 is an apocalyptic number.

It is an amenable number.

47925821 is a deficient number, since it is larger than the sum of its proper divisors (145123).

47925821 is a wasteful number, since it uses less digits than its factorization.

47925821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145122.

The product of its digits is 40320, while the sum is 38.

The square root of 47925821 is about 6922.8477521898. The cubic root of 47925821 is about 363.2368106721.

The spelling of 47925821 in words is "forty-seven million, nine hundred twenty-five thousand, eight hundred twenty-one".