40128726 has 16 divisors (see below), whose sum is σ = 87553728. Its totient is φ = 12160200.

The previous prime is 40128719. The next prime is 40128731. The reversal of 40128726 is 62782104.

It is a super-2 number, since 2×40128726² = 3220629300766152, which contains 22 as substring.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 40128693 and 40128702.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 303940 + ... + 304071.

It is an arithmetic number, because the mean of its divisors is an integer number (5472108).

Almost surely, 2^40128726 is an apocalyptic number.

40128726 is an abundant number, since it is smaller than the sum of its proper divisors (47425002).

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

40128726 is a wasteful number, since it uses less digits than its factorization.

40128726 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 608027.

The product of its (nonzero) digits is 5376, while the sum is 30.

The square root of 40128726 is about 6334.7238298129. The cubic root of 40128726 is about 342.3616604359.

The spelling of 40128726 in words is "forty million, one hundred twenty-eight thousand, seven hundred twenty-six".