40065540 has 48 divisors (see below), whose sum is σ = 117065088. Its totient is φ = 10219264.

The previous prime is 40065503. The next prime is 40065541. The reversal of 40065540 is 4556004.

It is a self number, because there is not a number n which added to its sum of digits gives 40065540.

It is not an unprimeable number, because it can be changed into a prime (40065541) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 13137 + ... + 15896.

It is an arithmetic number, because the mean of its divisors is an integer number (2438856).

Almost surely, 2^40065540 is an apocalyptic number.

It is an amenable number.

40065540 is an abundant number, since it is smaller than the sum of its proper divisors (76999548).

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

40065540 is a wasteful number, since it uses less digits than its factorization.

40065540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29068 (or 29066 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 24.

The square root of 40065540 is about 6329.7345915923. The cubic root of 40065540 is about 342.1818737842.

The spelling of 40065540 in words is "forty million, sixty-five thousand, five hundred forty".