4000123 has 4 divisors (see below), whose sum is σ = 4085280. Its totient is φ = 3914968.

The previous prime is 4000093. The next prime is 4000133. The reversal of 4000123 is 3210004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 4000123 - 2¹⁷ = 3869051 is a prime.

It is a Duffinian number.

4000123 is a modest number, since divided by 123 gives 40 as remainder.

It is not an unprimeable number, because it can be changed into a prime (4000133) 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 3 ways as a sum of consecutive naturals, for example, 42508 + ... + 42601.

It is an arithmetic number, because the mean of its divisors is an integer number (1021320).

Almost surely, 2^4000123 is an apocalyptic number.

4000123 is a deficient number, since it is larger than the sum of its proper divisors (85157).

4000123 is an equidigital number, since it uses as much as digits as its factorization.

4000123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85156.

The product of its (nonzero) digits is 24, while the sum is 10.

The square root of 4000123 is about 2000.0307497636. The cubic root of 4000123 is about 158.7417322662.

Adding to 4000123 its reverse (3210004), we get a palindrome (7210127).

The spelling of 4000123 in words is "four million, one hundred twenty-three", and thus it is an aban number.