47823921 has 6 divisors (see below), whose sum is σ = 69079010. Its totient is φ = 31882608.

The previous prime is 47823913. The next prime is 47823959. The reversal of 47823921 is 12932874.

It can be written as a sum of positive squares in only one way, i.e., 36433296 + 11390625 = 6036^2 + 3375^2 .

It is not a de Polignac number, because 47823921 - 2³ = 47823913 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (47823221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2656876 + ... + 2656893.

Almost surely, 2^47823921 is an apocalyptic number.

It is an amenable number.

47823921 is a deficient number, since it is larger than the sum of its proper divisors (21255089).

47823921 is a wasteful number, since it uses less digits than its factorization.

47823921 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5313775 (or 5313772 counting only the distinct ones).

The product of its digits is 24192, while the sum is 36.

The square root of 47823921 is about 6915.4841479104. The cubic root of 47823921 is about 362.9791896637.

The spelling of 47823921 in words is "forty-seven million, eight hundred twenty-three thousand, nine hundred twenty-one".