40993861 has 2 divisors, whose sum is σ = 40993862. Its totient is φ = 40993860.

The previous prime is 40993853. The next prime is 40993877. The reversal of 40993861 is 16839904.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36180225 + 4813636 = 6015^2 + 2194^2 .

It is a cyclic number.

It is not a de Polignac number, because 40993861 - 2³ = 40993853 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40993261) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20496930 + 20496931.

It is an arithmetic number, because the mean of its divisors is an integer number (20496931).

Almost surely, 2^40993861 is an apocalyptic number.

It is an amenable number.

40993861 is a deficient number, since it is larger than the sum of its proper divisors (1).

40993861 is an equidigital number, since it uses as much as digits as its factorization.

40993861 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 40993861 is about 6402.6448441250. The cubic root of 40993861 is about 344.8045129307.

The spelling of 40993861 in words is "forty million, nine hundred ninety-three thousand, eight hundred sixty-one".