40249709 has 4 divisors (see below), whose sum is σ = 41637660. Its totient is φ = 38861760.

The previous prime is 40249697. The next prime is 40249711. The reversal of 40249709 is 90794204.

40249709 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 29214025 + 11035684 = 5405^2 + 3322^2 .

It is a cyclic number.

It is not a de Polignac number, because 40249709 - 2⁸ = 40249453 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 (40249739) 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, 693932 + ... + 693989.

It is an arithmetic number, because the mean of its divisors is an integer number (10409415).

Almost surely, 2^40249709 is an apocalyptic number.

It is an amenable number.

40249709 is a deficient number, since it is larger than the sum of its proper divisors (1387951).

40249709 is a wasteful number, since it uses less digits than its factorization.

40249709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1387950.

The product of its (nonzero) digits is 18144, while the sum is 35.

The square root of 40249709 is about 6344.2658361705. The cubic root of 40249709 is about 342.7053741890.

The spelling of 40249709 in words is "forty million, two hundred forty-nine thousand, seven hundred nine".