4040023 has 4 divisors (see below), whose sum is σ = 4350808. Its totient is φ = 3729240.

The previous prime is 4040021. The next prime is 4040041. The reversal of 4040023 is 3200404.

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 4040023 - 2¹ = 4040021 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 310771 = 4040023 / (4 + 0 + 4 + 0 + 0 + 2 + 3).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4039985 and 4040012.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (4040021) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 155373 + ... + 155398.

It is an arithmetic number, because the mean of its divisors is an integer number (1087702).

Almost surely, 2^4040023 is an apocalyptic number.

4040023 is a deficient number, since it is larger than the sum of its proper divisors (310785).

4040023 is a wasteful number, since it uses less digits than its factorization.

4040023 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 310784.

The product of its (nonzero) digits is 96, while the sum is 13.

The square root of 4040023 is about 2009.9808456799. The cubic root of 4040023 is about 159.2677870755.

Adding to 4040023 its reverse (3200404), we get a palindrome (7240427).

The spelling of 4040023 in words is "four million, forty thousand, twenty-three".