40504421 has 4 divisors (see below), whose sum is σ = 42887052. Its totient is φ = 38121792.

The previous prime is 40504417. The next prime is 40504423. The reversal of 40504421 is 12440504.

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

It can be written as a sum of positive squares in 2 ways, for example, as 37576900 + 2927521 = 6130^2 + 1711^2 .

It is a cyclic number.

It is not a de Polignac number, because 40504421 - 2² = 40504417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40504393 and 40504402.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40504423) 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, 1191290 + ... + 1191323.

It is an arithmetic number, because the mean of its divisors is an integer number (10721763).

Almost surely, 2^40504421 is an apocalyptic number.

It is an amenable number.

40504421 is a deficient number, since it is larger than the sum of its proper divisors (2382631).

40504421 is a wasteful number, since it uses less digits than its factorization.

40504421 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2382630.

The product of its (nonzero) digits is 640, while the sum is 20.

The square root of 40504421 is about 6364.3083677647. The cubic root of 40504421 is about 343.4267680685.

Adding to 40504421 its reverse (12440504), we get a palindrome (52944925).

The spelling of 40504421 in words is "forty million, five hundred four thousand, four hundred twenty-one".