40040069 has 4 divisors (see below), whose sum is σ = 40795596. Its totient is φ = 39284544.

The previous prime is 40040041. The next prime is 40040093. The reversal of 40040069 is 96004004.

40040069 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 20811844 + 19228225 = 4562^2 + 4385^2 .

It is a cyclic number.

It is not a de Polignac number, because 40040069 - 2¹⁶ = 39974533 is a prime.

It is a super-2 number, since 2×40040069² = 3206414251049522, 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 (40040029) 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, 377684 + ... + 377789.

It is an arithmetic number, because the mean of its divisors is an integer number (10198899).

Almost surely, 2^40040069 is an apocalyptic number.

It is an amenable number.

40040069 is a deficient number, since it is larger than the sum of its proper divisors (755527).

40040069 is an equidigital number, since it uses as much as digits as its factorization.

40040069 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 755526.

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 40040069 is about 6327.7222600237. The cubic root of 40040069 is about 342.1093462695.

The spelling of 40040069 in words is "forty million, forty thousand, sixty-nine".