40018823 has 4 divisors (see below), whose sum is σ = 43097208. Its totient is φ = 36940440.

The previous prime is 40018757. The next prime is 40018859. The reversal of 40018823 is 32881004.

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 40018823 - 2⁸ = 40018567 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40018792 and 40018801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40011823) 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, 1539173 + ... + 1539198.

It is an arithmetic number, because the mean of its divisors is an integer number (10774302).

Almost surely, 2^40018823 is an apocalyptic number.

40018823 is a deficient number, since it is larger than the sum of its proper divisors (3078385).

40018823 is a wasteful number, since it uses less digits than its factorization.

40018823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3078384.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 40018823 is about 6326.0432341235. The cubic root of 40018823 is about 342.0488257183.

Adding to 40018823 its reverse (32881004), we get a palindrome (72899827).

The spelling of 40018823 in words is "forty million, eighteen thousand, eight hundred twenty-three".