4020621 has 16 divisors (see below), whose sum is σ = 5931840. Its totient is φ = 2401920.

The previous prime is 4020617. The next prime is 4020623. The reversal of 4020621 is 1260204.

It is not a de Polignac number, because 4020621 - 2² = 4020617 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 4020621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4020623) 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 15 ways as a sum of consecutive naturals, for example, 1575 + ... + 3243.

It is an arithmetic number, because the mean of its divisors is an integer number (370740).

Almost surely, 2^4020621 is an apocalyptic number.

It is an amenable number.

4020621 is a deficient number, since it is larger than the sum of its proper divisors (1911219).

4020621 is a wasteful number, since it uses less digits than its factorization.

4020621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1756.

The product of its (nonzero) digits is 96, while the sum is 15.

The square root of 4020621 is about 2005.1486229205. The cubic root of 4020621 is about 159.0124194247.

Adding to 4020621 its reverse (1260204), we get a palindrome (5280825).

The spelling of 4020621 in words is "four million, twenty thousand, six hundred twenty-one".