40320493 has 2 divisors, whose sum is σ = 40320494. Its totient is φ = 40320492.

The previous prime is 40320463. The next prime is 40320499. The reversal of 40320493 is 39402304.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 22155849 + 18164644 = 4707^2 + 4262^2 .

It is a cyclic number.

It is not a de Polignac number, because 40320493 - 2⁵ = 40320461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40320499) 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 as a sum of consecutive naturals, namely, 20160246 + 20160247.

It is an arithmetic number, because the mean of its divisors is an integer number (20160247).

Almost surely, 2^40320493 is an apocalyptic number.

It is an amenable number.

40320493 is a deficient number, since it is larger than the sum of its proper divisors (1).

40320493 is an equidigital number, since it uses as much as digits as its factorization.

40320493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 40320493 is about 6349.8419665374. The cubic root of 40320493 is about 342.9061528732.

Adding to 40320493 its reverse (39402304), we get a palindrome (79722797).

The spelling of 40320493 in words is "forty million, three hundred twenty thousand, four hundred ninety-three".