40143709 has 4 divisors (see below), whose sum is σ = 40244220. Its totient is φ = 40043200.

The previous prime is 40143703. The next prime is 40143721. The reversal of 40143709 is 90734104.

40143709 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 23716900 + 16426809 = 4870^2 + 4053^2 .

It is a cyclic number.

It is not a de Polignac number, because 40143709 - 2⁷ = 40143581 is a prime.

It is a super-2 number, since 2×40143709² = 3223034744553362, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40143703) 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, 49654 + ... + 50455.

It is an arithmetic number, because the mean of its divisors is an integer number (10061055).

Almost surely, 2^40143709 is an apocalyptic number.

It is an amenable number.

40143709 is a deficient number, since it is larger than the sum of its proper divisors (100511).

40143709 is a wasteful number, since it uses less digits than its factorization.

40143709 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100510.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 40143709 is about 6335.9063282217. The cubic root of 40143709 is about 342.4042647162.

The spelling of 40143709 in words is "forty million, one hundred forty-three thousand, seven hundred nine".