40045221 has 6 divisors (see below), whose sum is σ = 57843110. Its totient is φ = 26696808.

The previous prime is 40045199. The next prime is 40045241. The reversal of 40045221 is 12254004.

40045221 is a `hidden beast` number, since 400 + 45 + 221 = 666.

It can be written as a sum of positive squares in only one way, i.e., 30404196 + 9641025 = 5514^2 + 3105^2 .

It is not a de Polignac number, because 40045221 - 2⁹ = 40044709 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40045194 and 40045203.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40045241) 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 5 ways as a sum of consecutive naturals, for example, 2224726 + ... + 2224743.

Almost surely, 2^40045221 is an apocalyptic number.

It is an amenable number.

40045221 is a deficient number, since it is larger than the sum of its proper divisors (17797889).

40045221 is a wasteful number, since it uses less digits than its factorization.

40045221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4449475 (or 4449472 counting only the distinct ones).

The product of its (nonzero) digits is 320, while the sum is 18.

The square root of 40045221 is about 6328.1293444430. The cubic root of 40045221 is about 342.1240188363.

Adding to 40045221 its reverse (12254004), we get a palindrome (52299225).

The spelling of 40045221 in words is "forty million, forty-five thousand, two hundred twenty-one".