40288905 has 12 divisors (see below), whose sum is σ = 69834180. Its totient is φ = 21487392.

The previous prime is 40288903. The next prime is 40288951. The reversal of 40288905 is 50988204.

It can be written as a sum of positive squares in 2 ways, for example, as 10575504 + 29713401 = 3252^2 + 5451^2 .

It is not a de Polignac number, because 40288905 - 2¹ = 40288903 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40288905.

It is not an unprimeable number, because it can be changed into a prime (40288903) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 447610 + ... + 447699.

It is an arithmetic number, because the mean of its divisors is an integer number (5819515).

Almost surely, 2^40288905 is an apocalyptic number.

40288905 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40288905 is a deficient number, since it is larger than the sum of its proper divisors (29545275).

40288905 is a wasteful number, since it uses less digits than its factorization.

40288905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 895320 (or 895317 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 36.

The square root of 40288905 is about 6347.3541731969. The cubic root of 40288905 is about 342.8165826275.

The spelling of 40288905 in words is "forty million, two hundred eighty-eight thousand, nine hundred five".