4002523 has 4 divisors (see below), whose sum is σ = 4574320. Its totient is φ = 3430728.

The previous prime is 4002499. The next prime is 4002527. The reversal of 4002523 is 3252004.

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

It is a de Polignac number, because none of the positive numbers 2^k-4002523 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 4002497 and 4002506.

It is not an unprimeable number, because it can be changed into a prime (4002527) 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, 285888 + ... + 285901.

It is an arithmetic number, because the mean of its divisors is an integer number (1143580).

Almost surely, 2^4002523 is an apocalyptic number.

4002523 is a deficient number, since it is larger than the sum of its proper divisors (571797).

4002523 is an equidigital number, since it uses as much as digits as its factorization.

4002523 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571796.

The product of its (nonzero) digits is 240, while the sum is 16.

The square root of 4002523 is about 2000.6306505700. The cubic root of 4002523 is about 158.7734732893.

Adding to 4002523 its reverse (3252004), we get a palindrome (7254527).

The spelling of 4002523 in words is "four million, two thousand, five hundred twenty-three".