40128673 has 16 divisors (see below), whose sum is σ = 44432640. Its totient is φ = 36013824.

The previous prime is 40128659. The next prime is 40128679. The reversal of 40128673 is 37682104.

It is a cyclic number.

It is not a de Polignac number, because 40128673 - 2⁹ = 40128161 is a prime.

It is a super-2 number, since 2×40128673² = 3220620793481858, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40128679) 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, 86440 + ... + 86902.

It is an arithmetic number, because the mean of its divisors is an integer number (2777040).

Almost surely, 2^40128673 is an apocalyptic number.

It is an amenable number.

40128673 is a deficient number, since it is larger than the sum of its proper divisors (4303967).

40128673 is a wasteful number, since it uses less digits than its factorization.

40128673 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 648.

The product of its (nonzero) digits is 8064, while the sum is 31.

The square root of 40128673 is about 6334.7196465195. The cubic root of 40128673 is about 342.3615097111.

The spelling of 40128673 in words is "forty million, one hundred twenty-eight thousand, six hundred seventy-three".