40909221 has 6 divisors (see below), whose sum is σ = 59091110. Its totient is φ = 27272808.

The previous prime is 40909207. The next prime is 40909237. The reversal of 40909221 is 12290904.

It can be written as a sum of positive squares in only one way, i.e., 21986721 + 18922500 = 4689^2 + 4350^2 .

It is not a de Polignac number, because 40909221 - 2¹⁸ = 40647077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40907221) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2272726 + ... + 2272743.

Almost surely, 2^40909221 is an apocalyptic number.

It is an amenable number.

40909221 is a deficient number, since it is larger than the sum of its proper divisors (18181889).

40909221 is a wasteful number, since it uses less digits than its factorization.

40909221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4545475 (or 4545472 counting only the distinct ones).

The product of its (nonzero) digits is 1296, while the sum is 27.

The square root of 40909221 is about 6396.0316603344. The cubic root of 40909221 is about 344.5670435316.

The spelling of 40909221 in words is "forty million, nine hundred nine thousand, two hundred twenty-one".