40197811 has 2 divisors, whose sum is σ = 40197812. Its totient is φ = 40197810.

The previous prime is 40197803. The next prime is 40197881. The reversal of 40197811 is 11879104.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 40197811 - 2³ = 40197803 is a prime.

It is not a weakly prime, because it can be changed into another prime (40197881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20098905 + 20098906.

It is an arithmetic number, because the mean of its divisors is an integer number (20098906).

Almost surely, 2^40197811 is an apocalyptic number.

40197811 is a deficient number, since it is larger than the sum of its proper divisors (1).

40197811 is an equidigital number, since it uses as much as digits as its factorization.

40197811 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2016, while the sum is 31.

The square root of 40197811 is about 6340.1743666874. The cubic root of 40197811 is about 342.5580159949.

The spelling of 40197811 in words is "forty million, one hundred ninety-seven thousand, eight hundred eleven".