40909729 has 8 divisors (see below), whose sum is σ = 47168640. Its totient is φ = 34754496.

The previous prime is 40909699. The next prime is 40909733. The reversal of 40909729 is 92790904.

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

It is not a de Polignac number, because 40909729 - 2⁵ = 40909697 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 40909691 and 40909700.

It is not an unprimeable number, because it can be changed into a prime (40909529) 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, 25069 + ... + 26650.

It is an arithmetic number, because the mean of its divisors is an integer number (5896080).

Almost surely, 2^40909729 is an apocalyptic number.

It is an amenable number.

40909729 is a deficient number, since it is larger than the sum of its proper divisors (6258911).

40909729 is a wasteful number, since it uses less digits than its factorization.

40909729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51839.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 40909729 is about 6396.0713723347. The cubic root of 40909729 is about 344.5684697735.

The spelling of 40909729 in words is "forty million, nine hundred nine thousand, seven hundred twenty-nine".