40128641 has 8 divisors (see below), whose sum is σ = 46011264. Its totient is φ = 34283520.

The previous prime is 40128631. The next prime is 40128643. The reversal of 40128641 is 14682104.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40128641 - 2¹⁴ = 40112257 is a prime.

It is a super-2 number, since 2×40128641² = 3220615657013762, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40128641.

It is not an unprimeable number, because it can be changed into a prime (40128643) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7040 + ... + 11393.

It is an arithmetic number, because the mean of its divisors is an integer number (5751408).

Almost surely, 2^40128641 is an apocalyptic number.

It is an amenable number.

40128641 is a deficient number, since it is larger than the sum of its proper divisors (5882623).

40128641 is a wasteful number, since it uses less digits than its factorization.

40128641 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18751.

The product of its (nonzero) digits is 1536, while the sum is 26.

The square root of 40128641 is about 6334.7171207561. The cubic root of 40128641 is about 342.3614187075.

The spelling of 40128641 in words is "forty million, one hundred twenty-eight thousand, six hundred forty-one".