40394728 has 16 divisors (see below), whose sum is σ = 82625760. Its totient is φ = 18361200.

The previous prime is 40394671. The next prime is 40394729. The reversal of 40394728 is 82749304.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (40394729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 229428 + ... + 229603.

It is an arithmetic number, because the mean of its divisors is an integer number (5164110).

Almost surely, 2^40394728 is an apocalyptic number.

It is an amenable number.

40394728 is an abundant number, since it is smaller than the sum of its proper divisors (42231032).

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

40394728 is a wasteful number, since it uses less digits than its factorization.

40394728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 459048 (or 459044 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 37.

The square root of 40394728 is about 6355.6846995426. The cubic root of 40394728 is about 343.1164680256.

The spelling of 40394728 in words is "forty million, three hundred ninety-four thousand, seven hundred twenty-eight".