40287809 has 4 divisors (see below), whose sum is σ = 42408240. Its totient is φ = 38167380.

The previous prime is 40287803. The next prime is 40287823. The reversal of 40287809 is 90878204.

40287809 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, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40287809 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40287803) 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, 1060187 + ... + 1060224.

It is an arithmetic number, because the mean of its divisors is an integer number (10602060).

Almost surely, 2^40287809 is an apocalyptic number.

It is an amenable number.

40287809 is a deficient number, since it is larger than the sum of its proper divisors (2120431).

40287809 is a wasteful number, since it uses less digits than its factorization.

40287809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2120430.

The product of its (nonzero) digits is 32256, while the sum is 38.

The square root of 40287809 is about 6347.2678374242. The cubic root of 40287809 is about 342.8134739935.

The spelling of 40287809 in words is "forty million, two hundred eighty-seven thousand, eight hundred nine".