4021623 has 8 divisors (see below), whose sum is σ = 5958000. Its totient is φ = 2681064.

The previous prime is 4021613. The next prime is 4021627. The reversal of 4021623 is 3261204.

It is a happy number.

4021623 is a `hidden beast` number, since 40 + 2 + 1 + 623 = 666.

It is not a de Polignac number, because 4021623 - 2⁴ = 4021607 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 4021596 and 4021605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4021627) 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, 74448 + ... + 74501.

It is an arithmetic number, because the mean of its divisors is an integer number (744750).

Almost surely, 2^4021623 is an apocalyptic number.

4021623 is a deficient number, since it is larger than the sum of its proper divisors (1936377).

4021623 is a wasteful number, since it uses less digits than its factorization.

4021623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148958 (or 148952 counting only the distinct ones).

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

The square root of 4021623 is about 2005.3984641462. The cubic root of 4021623 is about 159.0256277665.

Adding to 4021623 its reverse (3261204), we get a palindrome (7282827).

It can be divided in two parts, 402 and 1623, that added together give a square (2025 = 45²).

The spelling of 4021623 in words is "four million, twenty-one thousand, six hundred twenty-three".