40688865 has 48 divisors (see below), whose sum is σ = 84159360. Its totient is φ = 18597600.

The previous prime is 40688849. The next prime is 40688867. The reversal of 40688865 is 56888604.

It is not a de Polignac number, because 40688865 - 2⁴ = 40688849 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 40688865.

It is not an unprimeable number, because it can be changed into a prime (40688867) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3540 + ... + 9690.

It is an arithmetic number, because the mean of its divisors is an integer number (1753320).

Almost surely, 2^40688865 is an apocalyptic number.

40688865 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40688865 is an abundant number, since it is smaller than the sum of its proper divisors (43470495).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

40688865 is a wasteful number, since it uses less digits than its factorization.

40688865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6179 (or 6166 counting only the distinct ones).

The product of its (nonzero) digits is 368640, while the sum is 45.

The square root of 40688865 is about 6378.7824073251. The cubic root of 40688865 is about 343.9472635265.

The spelling of 40688865 in words is "forty million, six hundred eighty-eight thousand, eight hundred sixty-five".