40728493 has 6 divisors (see below), whose sum is σ = 44102634. Its totient is φ = 37595376.

The previous prime is 40728491. The next prime is 40728503. The reversal of 40728493 is 39482704.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 2064969 + 38663524 = 1437^2 + 6218^2 .

It is not a de Polignac number, because 40728493 - 2¹ = 40728491 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40728491) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 120330 + ... + 120667.

It is an arithmetic number, because the mean of its divisors is an integer number (7350439).

Almost surely, 2^40728493 is an apocalyptic number.

It is an amenable number.

40728493 is a deficient number, since it is larger than the sum of its proper divisors (3374141).

40728493 is a wasteful number, since it uses less digits than its factorization.

40728493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241023 (or 241010 counting only the distinct ones).

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

The square root of 40728493 is about 6381.8878868247. The cubic root of 40728493 is about 344.0588871832.

It can be divided in two parts, 407 and 28493, that added together give a square (28900 = 170²).

The spelling of 40728493 in words is "forty million, seven hundred twenty-eight thousand, four hundred ninety-three".