40768691 has 4 divisors (see below), whose sum is σ = 40788384. Its totient is φ = 40749000.

The previous prime is 40768667. The next prime is 40768729. The reversal of 40768691 is 19686704.

40768691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40768691 - 2¹⁴ = 40752307 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40768631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6320 + ... + 11021.

It is an arithmetic number, because the mean of its divisors is an integer number (10197096).

Almost surely, 2^40768691 is an apocalyptic number.

40768691 is a deficient number, since it is larger than the sum of its proper divisors (19693).

40768691 is a wasteful number, since it uses less digits than its factorization.

40768691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19692.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 40768691 is about 6385.0364916733. The cubic root of 40768691 is about 344.1720424586.

The spelling of 40768691 in words is "forty million, seven hundred sixty-eight thousand, six hundred ninety-one".