40006540 has 36 divisors (see below), whose sum is σ = 97732656. Its totient is φ = 13716192.

The previous prime is 40006537. The next prime is 40006579. The reversal of 40006540 is 4560004.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19432 + ... + 21391.

It is an arithmetic number, because the mean of its divisors is an integer number (2714796).

Almost surely, 2^40006540 is an apocalyptic number.

It is an amenable number.

40006540 is an abundant number, since it is smaller than the sum of its proper divisors (57726116).

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

40006540 is a wasteful number, since it uses less digits than its factorization.

40006540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40846 (or 40837 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 19.

The square root of 40006540 is about 6325.0723316022. The cubic root of 40006540 is about 342.0138270574.

Adding to 40006540 its reverse (4560004), we get a palindrome (44566544).

The spelling of 40006540 in words is "forty million, six thousand, five hundred forty".