4072821 has 8 divisors (see below), whose sum is σ = 5716320. Its totient is φ = 2572272.

The previous prime is 4072819. The next prime is 4072837. The reversal of 4072821 is 1282704.

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

It is not a de Polignac number, because 4072821 - 2¹ = 4072819 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4072791 and 4072800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4072801) 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 7 ways as a sum of consecutive naturals, for example, 35670 + ... + 35783.

It is an arithmetic number, because the mean of its divisors is an integer number (714540).

Almost surely, 2^4072821 is an apocalyptic number.

It is an amenable number.

4072821 is a deficient number, since it is larger than the sum of its proper divisors (1643499).

4072821 is a wasteful number, since it uses less digits than its factorization.

4072821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71475.

The product of its (nonzero) digits is 896, while the sum is 24.

The square root of 4072821 is about 2018.1231379676. The cubic root of 4072821 is about 159.6976190000.

The spelling of 4072821 in words is "four million, seventy-two thousand, eight hundred twenty-one".