40491328 has 14 divisors (see below), whose sum is σ = 80350106. Its totient is φ = 20245632.

The previous prime is 40491317. The next prime is 40491343. The reversal of 40491328 is 82319404.

It can be written as a sum of positive squares in only one way, i.e., 22581504 + 17909824 = 4752^2 + 4232^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 40491328.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 316275 + ... + 316402.

Almost surely, 2^40491328 is an apocalyptic number.

It is an amenable number.

40491328 is a deficient number, since it is larger than the sum of its proper divisors (39858778).

40491328 is an equidigital number, since it uses as much as digits as its factorization.

40491328 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 632689 (or 632679 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 40491328 is about 6363.2796575351. The cubic root of 40491328 is about 343.3897599993.

The spelling of 40491328 in words is "forty million, four hundred ninety-one thousand, three hundred twenty-eight".