4023621 has 32 divisors (see below), whose sum is σ = 6944000. Its totient is φ = 2255040.

The previous prime is 4023619. The next prime is 4023629. The reversal of 4023621 is 1263204.

4023621 = 70² + 71² + ... + 231².

It is a happy number.

4023621 is a `hidden beast` number, since 40 + 2 + 3 + 621 = 666.

It is not a de Polignac number, because 4023621 - 2¹ = 4023619 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4023594 and 4023603.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4023629) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11355 + ... + 11703.

It is an arithmetic number, because the mean of its divisors is an integer number (217000).

Almost surely, 2^4023621 is an apocalyptic number.

It is an amenable number.

4023621 is a deficient number, since it is larger than the sum of its proper divisors (2920379).

4023621 is a wasteful number, since it uses less digits than its factorization.

4023621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 426 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 18.

The square root of 4023621 is about 2005.8965576520. The cubic root of 4023621 is about 159.0519588109.

Adding to 4023621 its reverse (1263204), we get a palindrome (5286825).

The spelling of 4023621 in words is "four million, twenty-three thousand, six hundred twenty-one".