40009863 has 4 divisors (see below), whose sum is σ = 53346488. Its totient is φ = 26673240.

The previous prime is 40009843. The next prime is 40009873. The reversal of 40009863 is 36890004.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 40009863 - 2²¹ = 37912711 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 40009863.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40009813) 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, 6668308 + ... + 6668313.

It is an arithmetic number, because the mean of its divisors is an integer number (13336622).

Almost surely, 2^40009863 is an apocalyptic number.

40009863 is a deficient number, since it is larger than the sum of its proper divisors (13336625).

40009863 is a wasteful number, since it uses less digits than its factorization.

40009863 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13336624.

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 40009863 is about 6325.3350108907. The cubic root of 40009863 is about 342.0232961799.

Adding to 40009863 its reverse (36890004), we get a palindrome (76899867).

The spelling of 40009863 in words is "forty million, nine thousand, eight hundred sixty-three".