40040221 has 4 divisors (see below), whose sum is σ = 43120252. Its totient is φ = 36960192.

The previous prime is 40040197. The next prime is 40040227. The reversal of 40040221 is 12204004.

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 5112121 + 34928100 = 2261^2 + 5910^2 .

It is a cyclic number.

It is not a de Polignac number, because 40040221 - 2⁷ = 40040093 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (13), and also a Moran number because the ratio is a prime number: 3080017 = 40040221 / (4 + 0 + 0 + 4 + 0 + 2 + 2 + 1).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40040227) 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, 1539996 + ... + 1540021.

It is an arithmetic number, because the mean of its divisors is an integer number (10780063).

Almost surely, 2^40040221 is an apocalyptic number.

It is an amenable number.

40040221 is a deficient number, since it is larger than the sum of its proper divisors (3080031).

40040221 is a wasteful number, since it uses less digits than its factorization.

40040221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3080030.

The product of its (nonzero) digits is 64, while the sum is 13.

The square root of 40040221 is about 6327.7342706533. The cubic root of 40040221 is about 342.1097791739.

Adding to 40040221 its reverse (12204004), we get a palindrome (52244225).

The spelling of 40040221 in words is "forty million, forty thousand, two hundred twenty-one".