40009231 has 8 divisors (see below), whose sum is σ = 42534000. Its totient is φ = 37526400.

The previous prime is 40009201. The next prime is 40009253. The reversal of 40009231 is 13290004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40009231 - 2¹¹ = 40007183 is a prime.

It is a super-2 number, since 2×40009231² = 3201477130422722, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40009199 and 40009208.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40009201) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8506 + ... + 12343.

It is an arithmetic number, because the mean of its divisors is an integer number (5316750).

Almost surely, 2^40009231 is an apocalyptic number.

40009231 is a deficient number, since it is larger than the sum of its proper divisors (2524769).

40009231 is a wasteful number, since it uses less digits than its factorization.

40009231 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20969.

The product of its (nonzero) digits is 216, while the sum is 19.

The square root of 40009231 is about 6325.2850528652. The cubic root of 40009231 is about 342.0214952918.

Adding to 40009231 its reverse (13290004), we get a palindrome (53299235).

It can be divided in two parts, 4000 and 9231, that added together give a palindrome (13231).

The spelling of 40009231 in words is "forty million, nine thousand, two hundred thirty-one".