52640421 has 4 divisors (see below), whose sum is σ = 70187232.
Its totient is φ = 35093612.
The previous prime is 52640417. The next prime is 52640437. The reversal of 52640421 is 12404625.
52640421 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
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 not a de Polignac number, because 52640421 - 22 = 52640417 is a prime.
It is a junction number, because it is equal to n+sod(n) for n = 52640391 and 52640400.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (52640461) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8773401 + ... + 8773406.
It is an arithmetic number, because the mean of its divisors is an integer number (17546808).
Almost surely, 252640421 is an apocalyptic number.
It is an amenable number.
52640421 is a deficient number, since it is larger than the sum of its proper divisors (17546811).
52640421 is a wasteful number, since it uses less digits than its factorization.
52640421 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 17546810.
The product of its (nonzero) digits is 1920, while the sum is 24.
The square root of 52640421 is about 7255.3718719305.
The cubic root of 52640421 is about 374.7771618302.
Note that the first 3 decimals are identical.
The spelling of 52640421 in words is "fifty-two million, six hundred forty thousand, four hundred twenty-one".