40815193 has 4 divisors (see below), whose sum is σ = 40954788. Its totient is φ = 40675600.

The previous prime is 40815191. The next prime is 40815199. The reversal of 40815193 is 39151804.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 38340864 + 2474329 = 6192^2 + 1573^2 .

It is a cyclic number.

It is not a de Polignac number, because 40815193 - 2¹ = 40815191 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 not an unprimeable number, because it can be changed into a prime (40815191) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 69358 + ... + 69943.

It is an arithmetic number, because the mean of its divisors is an integer number (10238697).

Almost surely, 2^40815193 is an apocalyptic number.

It is an amenable number.

40815193 is a deficient number, since it is larger than the sum of its proper divisors (139595).

40815193 is a wasteful number, since it uses less digits than its factorization.

40815193 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139594.

The product of its (nonzero) digits is 4320, while the sum is 31.

The square root of 40815193 is about 6388.6769365808. The cubic root of 40815193 is about 344.3028504114.

Adding to 40815193 its reverse (39151804), we get a palindrome (79966997).

The spelling of 40815193 in words is "forty million, eight hundred fifteen thousand, one hundred ninety-three".