40009331 has 4 divisors (see below), whose sum is σ = 40278000. Its totient is φ = 39740664.

The previous prime is 40009303. The next prime is 40009337. The reversal of 40009331 is 13390004.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40009331 is a prime.

It is a super-2 number, since 2×40009331² = 3201493134135122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40009337) 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, 134111 + ... + 134408.

It is an arithmetic number, because the mean of its divisors is an integer number (10069500).

Almost surely, 2^40009331 is an apocalyptic number.

40009331 is a deficient number, since it is larger than the sum of its proper divisors (268669).

40009331 is a wasteful number, since it uses less digits than its factorization.

40009331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268668.

The product of its (nonzero) digits is 324, while the sum is 20.

The square root of 40009331 is about 6325.2929576424. The cubic root of 40009331 is about 342.0217802437.

Adding to 40009331 its reverse (13390004), we get a palindrome (53399335).

It can be divided in two parts, 4000 and 9331, that added together give a palindrome (13331).

The spelling of 40009331 in words is "forty million, nine thousand, three hundred thirty-one".