40128894 has 24 divisors (see below), whose sum is σ = 93634632. Its totient is φ = 12347280.

The previous prime is 40128877. The next prime is 40128901. The reversal of 40128894 is 49882104.

40128894 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×40128894² = 3220656267326472, which contains 22 as substring.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85512 + ... + 85979.

It is an arithmetic number, because the mean of its divisors is an integer number (3901443).

Almost surely, 2^40128894 is an apocalyptic number.

40128894 is an abundant number, since it is smaller than the sum of its proper divisors (53505738).

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

40128894 is a wasteful number, since it uses less digits than its factorization.

40128894 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 171512 (or 171509 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 40128894 is about 6334.7370900456. The cubic root of 40128894 is about 342.3621382040.

The spelling of 40128894 in words is "forty million, one hundred twenty-eight thousand, eight hundred ninety-four".