47418821 has 4 divisors (see below), whose sum is σ = 47447712. Its totient is φ = 47389932.

The previous prime is 47418757. The next prime is 47418853. The reversal of 47418821 is 12881474.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12881474 = 2 ⋅6440737.

It is a cyclic number.

It is not a de Polignac number, because 47418821 - 2⁶ = 47418757 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 (47408821) 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, 11825 + ... + 15318.

It is an arithmetic number, because the mean of its divisors is an integer number (11861928).

Almost surely, 2^47418821 is an apocalyptic number.

It is an amenable number.

47418821 is a deficient number, since it is larger than the sum of its proper divisors (28891).

47418821 is a wasteful number, since it uses less digits than its factorization.

47418821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28890.

The product of its digits is 14336, while the sum is 35.

The square root of 47418821 is about 6886.1325139733. The cubic root of 47418821 is about 361.9513914770.

The spelling of 47418821 in words is "forty-seven million, four hundred eighteen thousand, eight hundred twenty-one".