40128517 has 24 divisors (see below), whose sum is σ = 50131872. Its totient is φ = 31660800.

The previous prime is 40128509. The next prime is 40128541. The reversal of 40128517 is 71582104.

It is not a de Polignac number, because 40128517 - 2³ = 40128509 is a prime.

It is a super-2 number, since 2×40128517² = 3220595753238578, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40128617) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 40842 + ... + 41812.

It is an arithmetic number, because the mean of its divisors is an integer number (2088828).

Almost surely, 2^40128517 is an apocalyptic number.

It is an amenable number.

40128517 is a deficient number, since it is larger than the sum of its proper divisors (10003355).

40128517 is a wasteful number, since it uses less digits than its factorization.

40128517 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1029 (or 1012 counting only the distinct ones).

The product of its (nonzero) digits is 2240, while the sum is 28.

The square root of 40128517 is about 6334.7073334133. The cubic root of 40128517 is about 342.3610660677.

The spelling of 40128517 in words is "forty million, one hundred twenty-eight thousand, five hundred seventeen".