40404023 has 4 divisors (see below), whose sum is σ = 44077128. Its totient is φ = 36730920.

The previous prime is 40404017. The next prime is 40404043. The reversal of 40404023 is 32040404.

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 40404023 - 2⁸ = 40403767 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40403992 and 40404010.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40404043) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1836536 + ... + 1836557.

It is an arithmetic number, because the mean of its divisors is an integer number (11019282).

Almost surely, 2^40404023 is an apocalyptic number.

40404023 is a deficient number, since it is larger than the sum of its proper divisors (3673105).

40404023 is a wasteful number, since it uses less digits than its factorization.

40404023 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3673104.

The product of its (nonzero) digits is 384, while the sum is 17.

The square root of 40404023 is about 6356.4158926238. The cubic root of 40404023 is about 343.1427835305.

Adding to 40404023 its reverse (32040404), we get a palindrome (72444427).

The spelling of 40404023 in words is "forty million, four hundred four thousand, twenty-three".