40809915 has 24 divisors (see below), whose sum is σ = 71901648. Its totient is φ = 21407040.

The previous prime is 40809913. The next prime is 40809917. The reversal of 40809915 is 51990804.

It is an interprime number because it is at equal distance from previous prime (40809913) and next prime (40809917).

It is not a de Polignac number, because 40809915 - 2¹ = 40809913 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40809915.

It is not an unprimeable number, because it can be changed into a prime (40809913) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 4689 + ... + 10178.

It is an arithmetic number, because the mean of its divisors is an integer number (2995902).

Almost surely, 2^40809915 is an apocalyptic number.

40809915 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

40809915 is a deficient number, since it is larger than the sum of its proper divisors (31091733).

40809915 is a wasteful number, since it uses less digits than its factorization.

40809915 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14939 (or 14936 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 36.

The square root of 40809915 is about 6388.2638486525. The cubic root of 40809915 is about 344.2880086442.

The spelling of 40809915 in words is "forty million, eight hundred nine thousand, nine hundred fifteen".