40168693 has 2 divisors, whose sum is σ = 40168694. Its totient is φ = 40168692.

The previous prime is 40168663. The next prime is 40168699. The reversal of 40168693 is 39686104.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 24621444 + 15547249 = 4962^2 + 3943^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40168693 is a prime.

It is a super-2 number, since 2×40168693² = 3227047794656498, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40168699) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20084346 + 20084347.

It is an arithmetic number, because the mean of its divisors is an integer number (20084347).

Almost surely, 2^40168693 is an apocalyptic number.

It is an amenable number.

40168693 is a deficient number, since it is larger than the sum of its proper divisors (1).

40168693 is an equidigital number, since it uses as much as digits as its factorization.

40168693 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 31104, while the sum is 37.

The square root of 40168693 is about 6337.8776416084. The cubic root of 40168693 is about 342.4752833496.

The spelling of 40168693 in words is "forty million, one hundred sixty-eight thousand, six hundred ninety-three".