40672309 has 4 divisors (see below), whose sum is σ = 40712716. Its totient is φ = 40631904.

The previous prime is 40672267. The next prime is 40672321. The reversal of 40672309 is 90327604.

40672309 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.

It can be written as a sum of positive squares in 2 ways, for example, as 39652209 + 1020100 = 6297^2 + 1010^2 .

It is a cyclic number.

It is not a de Polignac number, because 40672309 - 2¹¹ = 40670261 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40672399) 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, 18654 + ... + 20719.

It is an arithmetic number, because the mean of its divisors is an integer number (10178179).

Almost surely, 2^40672309 is an apocalyptic number.

It is an amenable number.

40672309 is a deficient number, since it is larger than the sum of its proper divisors (40407).

40672309 is a wasteful number, since it uses less digits than its factorization.

40672309 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40406.

The product of its (nonzero) digits is 9072, while the sum is 31.

The square root of 40672309 is about 6377.4845354575. The cubic root of 40672309 is about 343.9006073270.

The spelling of 40672309 in words is "forty million, six hundred seventy-two thousand, three hundred nine".