40008645 has 12 divisors (see below), whose sum is σ = 69348396. Its totient is φ = 21337920.

The previous prime is 40008643. The next prime is 40008649. The reversal of 40008645 is 54680004.

It can be written as a sum of positive squares in 2 ways, for example, as 29877156 + 10131489 = 5466^2 + 3183^2 .

It is not a de Polignac number, because 40008645 - 2¹ = 40008643 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40008643) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 444496 + ... + 444585.

It is an arithmetic number, because the mean of its divisors is an integer number (5779033).

Almost surely, 2^40008645 is an apocalyptic number.

40008645 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40008645 is a deficient number, since it is larger than the sum of its proper divisors (29339751).

40008645 is a wasteful number, since it uses less digits than its factorization.

40008645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 889092 (or 889089 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 27.

The square root of 40008645 is about 6325.2387306725. The cubic root of 40008645 is about 342.0198254640.

Adding to 40008645 its reverse (54680004), we get a palindrome (94688649).

The spelling of 40008645 in words is "forty million, eight thousand, six hundred forty-five".