40338909 has 36 divisors (see below), whose sum is σ = 66713556. Its totient is φ = 23344128.

The previous prime is 40338899. The next prime is 40338923. The reversal of 40338909 is 90983304.

It can be written as a sum of positive squares in 6 ways, for example, as 459684 + 39879225 = 678^2 + 6315^2 .

It is not a de Polignac number, because 40338909 - 2¹¹ = 40336861 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40338959) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 33217 + ... + 34409.

Almost surely, 2^40338909 is an apocalyptic number.

It is an amenable number.

40338909 is a deficient number, since it is larger than the sum of its proper divisors (26374647).

40338909 is a wasteful number, since it uses less digits than its factorization.

40338909 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1246 (or 1226 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 40338909 is about 6351.2919158231. The cubic root of 40338909 is about 342.9583512968.

The spelling of 40338909 in words is "forty million, three hundred thirty-eight thousand, nine hundred nine".