40291728 has 40 divisors (see below), whose sum is σ = 105130176. Its totient is φ = 13296000.

The previous prime is 40291711. The next prime is 40291739. The reversal of 40291728 is 82719204.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 693 + ... + 9003.

Almost surely, 2^40291728 is an apocalyptic number.

40291728 is a gapful number since it is divisible by the number (48) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 40291728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52565088).

40291728 is an abundant number, since it is smaller than the sum of its proper divisors (64838448).

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

40291728 is a wasteful number, since it uses less digits than its factorization.

40291728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8423 (or 8417 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 40291728 is about 6347.5765454227. The cubic root of 40291728 is about 342.8245893695.

The spelling of 40291728 in words is "forty million, two hundred ninety-one thousand, seven hundred twenty-eight".