4990821 has 8 divisors (see below), whose sum is σ = 7259424. Its totient is φ = 3024720.

The previous prime is 4990781. The next prime is 4990823. The reversal of 4990821 is 1280994.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 4990821 - 2⁷ = 4990693 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33), and also a Moran number because the ratio is a prime number: 151237 = 4990821 / (4 + 9 + 9 + 0 + 8 + 2 + 1).

4990821 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4990823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75586 + ... + 75651.

It is an arithmetic number, because the mean of its divisors is an integer number (907428).

Almost surely, 2^4990821 is an apocalyptic number.

It is an amenable number.

4990821 is a deficient number, since it is larger than the sum of its proper divisors (2268603).

4990821 is a wasteful number, since it uses less digits than its factorization.

4990821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 151251.

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 4990821 is about 2234.0145478488. The cubic root of 4990821 is about 170.8928914420.

The spelling of 4990821 in words is "four million, nine hundred ninety thousand, eight hundred twenty-one".