40221909 has 48 divisors (see below), whose sum is σ = 72671872. Its totient is φ = 20870784.

The previous prime is 40221889. The next prime is 40221913. The reversal of 40221909 is 90912204.

It is not a de Polignac number, because 40221909 - 2⁵ = 40221877 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40221959) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 54507 + ... + 55239.

Almost surely, 2^40221909 is an apocalyptic number.

It is an amenable number.

40221909 is a deficient number, since it is larger than the sum of its proper divisors (32449963).

40221909 is a wasteful number, since it uses less digits than its factorization.

40221909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 826 (or 823 counting only the distinct ones).

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

The square root of 40221909 is about 6342.0745028736. The cubic root of 40221909 is about 342.6264551614.

The spelling of 40221909 in words is "forty million, two hundred twenty-one thousand, nine hundred nine".