40023523 has 4 divisors (see below), whose sum is σ = 40152528. Its totient is φ = 39894520.

The previous prime is 40023499. The next prime is 40023551. The reversal of 40023523 is 32532004.

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 40023523 - 2²⁵ = 6469091 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40023523.

It is not an unprimeable number, because it can be changed into a prime (40023223) 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, 64036 + ... + 64657.

It is an arithmetic number, because the mean of its divisors is an integer number (10038132).

Almost surely, 2^40023523 is an apocalyptic number.

40023523 is a deficient number, since it is larger than the sum of its proper divisors (129005).

40023523 is a wasteful number, since it uses less digits than its factorization.

40023523 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 129004.

The product of its (nonzero) digits is 720, while the sum is 19.

The square root of 40023523 is about 6326.4147034478. The cubic root of 40023523 is about 342.0622158052.

Adding to 40023523 its reverse (32532004), we get a palindrome (72555527).

The spelling of 40023523 in words is "forty million, twenty-three thousand, five hundred twenty-three".