40640693 has 8 divisors (see below), whose sum is σ = 43516440. Its totient is φ = 37818880.

The previous prime is 40640671. The next prime is 40640707. The reversal of 40640693 is 39604604.

It can be written as a sum of positive squares in 4 ways, for example, as 165649 + 40475044 = 407^2 + 6362^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40640693 - 2⁸ = 40640437 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40640603) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11918 + ... + 14943.

It is an arithmetic number, because the mean of its divisors is an integer number (5439555).

Almost surely, 2^40640693 is an apocalyptic number.

It is an amenable number.

40640693 is a deficient number, since it is larger than the sum of its proper divisors (2875747).

40640693 is a wasteful number, since it uses less digits than its factorization.

40640693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26967.

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 40640693 is about 6375.0053333311. The cubic root of 40640693 is about 343.8114755947.

The spelling of 40640693 in words is "forty million, six hundred forty thousand, six hundred ninety-three".