40909609 has 8 divisors (see below), whose sum is σ = 44121672. Its totient is φ = 37706880.

The previous prime is 40909591. The next prime is 40909613. The reversal of 40909609 is 90690904.

It can be written as a sum of positive squares in 4 ways, for example, as 205209 + 40704400 = 453^2 + 6380^2 .

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 40909609 - 2⁹ = 40909097 is a prime.

It is a super-2 number, since 2×40909609² = 3347192217065762, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40909699) 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, 8757 + ... + 12589.

It is an arithmetic number, because the mean of its divisors is an integer number (5515209).

Almost surely, 2^40909609 is an apocalyptic number.

It is an amenable number.

40909609 is a deficient number, since it is larger than the sum of its proper divisors (3212063).

40909609 is a wasteful number, since it uses less digits than its factorization.

40909609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4667.

The product of its (nonzero) digits is 17496, while the sum is 37.

The square root of 40909609 is about 6396.0619915695. The cubic root of 40909609 is about 344.5681328671.

The spelling of 40909609 in words is "forty million, nine hundred nine thousand, six hundred nine".