40196861 has 2 divisors, whose sum is σ = 40196862. Its totient is φ = 40196860.

The previous prime is 40196833. The next prime is 40196879. The reversal of 40196861 is 16869104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39000025 + 1196836 = 6245^2 + 1094^2 .

It is a cyclic number.

It is not a de Polignac number, because 40196861 - 2²² = 36002557 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40196881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20098430 + 20098431.

It is an arithmetic number, because the mean of its divisors is an integer number (20098431).

Almost surely, 2^40196861 is an apocalyptic number.

It is an amenable number.

40196861 is a deficient number, since it is larger than the sum of its proper divisors (1).

40196861 is an equidigital number, since it uses as much as digits as its factorization.

40196861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 10368, while the sum is 35.

The square root of 40196861 is about 6340.0994471696. The cubic root of 40196861 is about 342.5553174011. Note that the first 3 decimals are identical.

The spelling of 40196861 in words is "forty million, one hundred ninety-six thousand, eight hundred sixty-one".