40820197 has 12 divisors (see below), whose sum is σ = 46419660. Its totient is φ = 35826560.

The previous prime is 40820183. The next prime is 40820231. The reversal of 40820197 is 79102804.

It can be written as a sum of positive squares in 2 ways, for example, as 24611521 + 16208676 = 4961^2 + 4026^2 .

It is not a de Polignac number, because 40820197 - 2⁷ = 40820069 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 (40820107) 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 11 ways as a sum of consecutive naturals, for example, 2308 + ... + 9325.

It is an arithmetic number, because the mean of its divisors is an integer number (3868305).

Almost surely, 2^40820197 is an apocalyptic number.

It is an amenable number.

40820197 is a deficient number, since it is larger than the sum of its proper divisors (5599463).

40820197 is a wasteful number, since it uses less digits than its factorization.

40820197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11684 (or 11673 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 40820197 is about 6389.0685549617. The cubic root of 40820197 is about 344.3169205075.

The spelling of 40820197 in words is "forty million, eight hundred twenty thousand, one hundred ninety-seven".