40045709 has 4 divisors (see below), whose sum is σ = 43686240. Its totient is φ = 36405180.

The previous prime is 40045703. The next prime is 40045741. The reversal of 40045709 is 90754004.

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 40045709 - 2²⁴ = 23268493 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40045703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1820249 + ... + 1820270.

It is an arithmetic number, because the mean of its divisors is an integer number (10921560).

Almost surely, 2^40045709 is an apocalyptic number.

It is an amenable number.

40045709 is a deficient number, since it is larger than the sum of its proper divisors (3640531).

40045709 is a wasteful number, since it uses less digits than its factorization.

40045709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3640530.

The product of its (nonzero) digits is 5040, while the sum is 29.

The square root of 40045709 is about 6328.1679023237. The cubic root of 40045709 is about 342.1254085639.

The spelling of 40045709 in words is "forty million, forty-five thousand, seven hundred nine".