40688693 has 2 divisors, whose sum is σ = 40688694. Its totient is φ = 40688692.

The previous prime is 40688689. The next prime is 40688717. The reversal of 40688693 is 39688604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36457444 + 4231249 = 6038^2 + 2057^2 .

It is a cyclic number.

It is not a de Polignac number, because 40688693 - 2² = 40688689 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (40688603) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20344346 + 20344347.

It is an arithmetic number, because the mean of its divisors is an integer number (20344347).

Almost surely, 2^40688693 is an apocalyptic number.

It is an amenable number.

40688693 is a deficient number, since it is larger than the sum of its proper divisors (1).

40688693 is an equidigital number, since it uses as much as digits as its factorization.

40688693 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 248832, while the sum is 44.

The square root of 40688693 is about 6378.7689251140. The cubic root of 40688693 is about 343.9467788811.

The spelling of 40688693 in words is "forty million, six hundred eighty-eight thousand, six hundred ninety-three".