40509493 has 2 divisors, whose sum is σ = 40509494. Its totient is φ = 40509492.

The previous prime is 40509479. The next prime is 40509499. The reversal of 40509493 is 39490504.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39413284 + 1096209 = 6278^2 + 1047^2 .

It is a cyclic number.

It is not a de Polignac number, because 40509493 - 2⁵ = 40509461 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40509499) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20254746 + 20254747.

It is an arithmetic number, because the mean of its divisors is an integer number (20254747).

Almost surely, 2^40509493 is an apocalyptic number.

It is an amenable number.

40509493 is a deficient number, since it is larger than the sum of its proper divisors (1).

40509493 is an equidigital number, since it uses as much as digits as its factorization.

40509493 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 40509493 is about 6364.7068274980. The cubic root of 40509493 is about 343.4411022064.

Adding to 40509493 its reverse (39490504), we get a palindrome (79999997).

The spelling of 40509493 in words is "forty million, five hundred nine thousand, four hundred ninety-three".