4981821 has 8 divisors (see below), whose sum is σ = 7153440. Its totient is φ = 3065712.

The previous prime is 4981811. The next prime is 4981861. The reversal of 4981821 is 1281894.

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

It is not a de Polignac number, because 4981821 - 2⁵ = 4981789 is a prime.

4981821 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4981811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 63831 + ... + 63908.

It is an arithmetic number, because the mean of its divisors is an integer number (894180).

Almost surely, 2^4981821 is an apocalyptic number.

It is an amenable number.

4981821 is a deficient number, since it is larger than the sum of its proper divisors (2171619).

4981821 is a wasteful number, since it uses less digits than its factorization.

4981821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127755.

The product of its digits is 4608, while the sum is 33.

The square root of 4981821 is about 2231.9993279569. Note that the first 3 decimals coincide. The cubic root of 4981821 is about 170.7901053160.

The spelling of 4981821 in words is "four million, nine hundred eighty-one thousand, eight hundred twenty-one".