40002709 has 4 divisors (see below), whose sum is σ = 40015360. Its totient is φ = 39990060.

The previous prime is 40002691. The next prime is 40002719. The reversal of 40002709 is 90720004.

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, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 40002709 - 2⁹ = 40002197 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40002709.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40002719) 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, 3082 + ... + 9460.

It is an arithmetic number, because the mean of its divisors is an integer number (10003840).

Almost surely, 2^40002709 is an apocalyptic number.

It is an amenable number.

40002709 is a deficient number, since it is larger than the sum of its proper divisors (12651).

40002709 is an equidigital number, since it uses as much as digits as its factorization.

40002709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12650.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 40002709 is about 6324.7694819653. The cubic root of 40002709 is about 342.0029097025.

The spelling of 40002709 in words is "forty million, two thousand, seven hundred nine".