40394816 has 84 divisors (see below), whose sum is σ = 101809296. Its totient is φ = 15724800.

The previous prime is 40394813. The next prime is 40394821. The reversal of 40394816 is 61849304.

It is not an unprimeable number, because it can be changed into a prime (40394813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 33911 + ... + 35081.

Almost surely, 2^40394816 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 40394816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50904648).

40394816 is an abundant number, since it is smaller than the sum of its proper divisors (61414480).

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

40394816 is a wasteful number, since it uses less digits than its factorization.

40394816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1208 (or 1191 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 40394816 is about 6355.6916224751. The cubic root of 40394816 is about 343.1167171854.

The spelling of 40394816 in words is "forty million, three hundred ninety-four thousand, eight hundred sixteen".