40843997 has 2 divisors, whose sum is σ = 40843998. Its totient is φ = 40843996.

The previous prime is 40843951. The next prime is 40844017. The reversal of 40843997 is 79934804.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40780996 + 63001 = 6386^2 + 251^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40843997 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40893997) 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 as a sum of consecutive naturals, namely, 20421998 + 20421999.

It is an arithmetic number, because the mean of its divisors is an integer number (20421999).

Almost surely, 2^40843997 is an apocalyptic number.

It is an amenable number.

40843997 is a deficient number, since it is larger than the sum of its proper divisors (1).

40843997 is an equidigital number, since it uses as much as digits as its factorization.

40843997 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 40843997 is about 6390.9308398699. The cubic root of 40843997 is about 344.3838248930.

The spelling of 40843997 in words is "forty million, eight hundred forty-three thousand, nine hundred ninety-seven".