40609729 has 4 divisors (see below), whose sum is σ = 41028484. Its totient is φ = 40190976.

The previous prime is 40609727. The next prime is 40609741. The reversal of 40609729 is 92790604.

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

It can be written as a sum of positive squares in 2 ways, for example, as 27541504 + 13068225 = 5248^2 + 3615^2 .

It is a cyclic number.

It is not a de Polignac number, because 40609729 - 2¹ = 40609727 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40609727) 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, 209232 + ... + 209425.

It is an arithmetic number, because the mean of its divisors is an integer number (10257121).

Almost surely, 2^40609729 is an apocalyptic number.

It is an amenable number.

40609729 is a deficient number, since it is larger than the sum of its proper divisors (418755).

40609729 is an equidigital number, since it uses as much as digits as its factorization.

40609729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 418754.

The product of its (nonzero) digits is 27216, while the sum is 37.

The square root of 40609729 is about 6372.5763235916. The cubic root of 40609729 is about 343.7241371616.

The spelling of 40609729 in words is "forty million, six hundred nine thousand, seven hundred twenty-nine".