40066809 has 4 divisors (see below), whose sum is σ = 53422416. Its totient is φ = 26711204.

The previous prime is 40066783. The next prime is 40066811. The reversal of 40066809 is 90866004.

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.

It is a cyclic number.

It is not a de Polignac number, because 40066809 - 2²³ = 31678201 is a prime.

It is a super-3 number, since 3×40066809³ (a number of 24 digits) contains 333 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 40066809.

It is not an unprimeable number, because it can be changed into a prime (40066309) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6677799 + ... + 6677804.

It is an arithmetic number, because the mean of its divisors is an integer number (13355604).

Almost surely, 2^40066809 is an apocalyptic number.

It is an amenable number.

40066809 is a deficient number, since it is larger than the sum of its proper divisors (13355607).

40066809 is a wasteful number, since it uses less digits than its factorization.

40066809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13355606.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 40066809 is about 6329.8348319684. The cubic root of 40066809 is about 342.1854864000.

The spelling of 40066809 in words is "forty million, sixty-six thousand, eight hundred nine".