40308493 has 4 divisors (see below), whose sum is σ = 40363488. Its totient is φ = 40253500.

The previous prime is 40308491. The next prime is 40308497. The reversal of 40308493 is 39480304.

40308493 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 40308493 - 2¹ = 40308491 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40308491) by changing a digit.

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 in 3 ways as a sum of consecutive naturals, for example, 26383 + ... + 27868.

It is an arithmetic number, because the mean of its divisors is an integer number (10090872).

Almost surely, 2^40308493 is an apocalyptic number.

It is an amenable number.

40308493 is a deficient number, since it is larger than the sum of its proper divisors (54995).

40308493 is an equidigital number, since it uses as much as digits as its factorization.

40308493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54994.

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 40308493 is about 6348.8969908166. The cubic root of 40308493 is about 342.8721314463.

Adding to 40308493 its reverse (39480304), we get a palindrome (79788797).

The spelling of 40308493 in words is "forty million, three hundred eight thousand, four hundred ninety-three".