4000023 has 32 divisors (see below), whose sum is σ = 6297600. Its totient is φ = 2536920.

The previous prime is 3999971. The next prime is 4000037. The reversal of 4000023 is 3200004.

4000023 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 4000023 - 2⁹ = 3999511 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (9).

It is a junction number, because it is equal to n+sod(n) for n = 3999969 and 4000014.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4000043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 67768 + ... + 67826.

It is an arithmetic number, because the mean of its divisors is an integer number (196800).

Almost surely, 2^4000023 is an apocalyptic number.

4000023 is a deficient number, since it is larger than the sum of its proper divisors (2297577).

4000023 is an frugal number, since it uses more digits than its factorization.

4000023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111 (or 93 counting only the distinct ones).

The product of its (nonzero) digits is 24, while the sum is 9.

The square root of 4000023 is about 2000.0057499917. The cubic root of 4000023 is about 158.7404094481.

Adding to 4000023 its reverse (3200004), we get a palindrome (7200027).

The spelling of 4000023 in words is "four million, twenty-three", and thus it is an aban number.