47621 has 4 divisors (see below), whose sum is σ = 54432. Its totient is φ = 40812.

The previous prime is 47609. The next prime is 47623. The reversal of 47621 is 12674.

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: 12674 = 2 ⋅6337.

It is a cyclic number.

It is not a de Polignac number, because 47621 - 2¹⁴ = 31237 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 47593 and 47602.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 47621.

It is not an unprimeable number, because it can be changed into a prime (47623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3395 + ... + 3408.

It is an arithmetic number, because the mean of its divisors is an integer number (13608).

2⁴⁷⁶²¹ is an apocalyptic number.

It is an amenable number.

47621 is a deficient number, since it is larger than the sum of its proper divisors (6811).

47621 is an equidigital number, since it uses as much as digits as its factorization.

47621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6810.

The product of its digits is 336, while the sum is 20.

The square root of 47621 is about 218.2223636569. Note that the first 3 decimals coincide. The cubic root of 47621 is about 36.2465077888.

The spelling of 47621 in words is "forty-seven thousand, six hundred twenty-one".