4905821 has 4 divisors (see below), whose sum is σ = 4968000. Its totient is φ = 4843644.

The previous prime is 4905799. The next prime is 4905829. The reversal of 4905821 is 1285094.

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: 1285094 = 2 ⋅642547.

It is a cyclic number.

It is not a de Polignac number, because 4905821 - 2²² = 711517 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 (4905829) 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, 30971 + ... + 31128.

It is an arithmetic number, because the mean of its divisors is an integer number (1242000).

Almost surely, 2^4905821 is an apocalyptic number.

It is an amenable number.

4905821 is a deficient number, since it is larger than the sum of its proper divisors (62179).

4905821 is an equidigital number, since it uses as much as digits as its factorization.

4905821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 62178.

The product of its (nonzero) digits is 2880, while the sum is 29.

The square root of 4905821 is about 2214.9088017343. The cubic root of 4905821 is about 169.9171568679.

The spelling of 4905821 in words is "four million, nine hundred five thousand, eight hundred twenty-one".