40909289 has 4 divisors (see below), whose sum is σ = 41402256. Its totient is φ = 40416324.
The previous prime is 40909279. The next prime is 40909301. The reversal of 40909289 is 98290904.
40909289 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.
It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.
It is a cyclic number.
It is not a de Polignac number, because 40909289 - 220 = 39860713 is a prime.
It is a Duffinian number.
It is not an unprimeable number, because it can be changed into a prime (40909279) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 246359 + ... + 246524.
It is an arithmetic number, because the mean of its divisors is an integer number (10350564).
Almost surely, 240909289 is an apocalyptic number.
It is an amenable number.
40909289 is a deficient number, since it is larger than the sum of its proper divisors (492967).
40909289 is an equidigital number, since it uses as much as digits as its factorization.
40909289 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 492966.
The product of its (nonzero) digits is 46656, while the sum is 41.
The square root of 40909289 is about 6396.0369761283. The cubic root of 40909289 is about 344.5672344466.
The spelling of 40909289 in words is "forty million, nine hundred nine thousand, two hundred eighty-nine".
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