40019928 has 128 divisors (see below), whose sum is σ = 116793600. Its totient is φ = 11321856.

The previous prime is 40019911. The next prime is 40019933. The reversal of 40019928 is 82991004.

40019928 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 31 ways as a sum of consecutive naturals, for example, 254826 + ... + 254982.

It is an arithmetic number, because the mean of its divisors is an integer number (912450).

Almost surely, 2^40019928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40019928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (58396800).

40019928 is an abundant number, since it is smaller than the sum of its proper divisors (76773672).

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

40019928 is a wasteful number, since it uses less digits than its factorization.

40019928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241 (or 237 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 33.

The square root of 40019928 is about 6326.1305708940. The cubic root of 40019928 is about 342.0519739075.

The spelling of 40019928 in words is "forty million, nineteen thousand, nine hundred twenty-eight".