40400728 has 8 divisors (see below), whose sum is σ = 75751380. Its totient is φ = 20200360.

The previous prime is 40400713. The next prime is 40400743. The reversal of 40400728 is 82700404.

40400728 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (40400713) and next prime (40400743).

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-3 number, since 3×40400728³ (a number of 24 digits) contains 333 as substring.

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 as a sum of consecutive naturals, namely, 2525038 + ... + 2525053.

Almost surely, 2^40400728 is an apocalyptic number.

It is an amenable number.

40400728 is a deficient number, since it is larger than the sum of its proper divisors (35350652).

40400728 is a wasteful number, since it uses less digits than its factorization.

40400728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5050097 (or 5050093 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 25.

The square root of 40400728 is about 6356.1567003969. The cubic root of 40400728 is about 343.1334553652.

The spelling of 40400728 in words is "forty million, four hundred thousand, seven hundred twenty-eight".