40556691 has 24 divisors (see below), whose sum is σ = 67901184. Its totient is φ = 22846320.

The previous prime is 40556689. The next prime is 40556701. The reversal of 40556691 is 19665504.

40556691 is a `hidden beast` number, since 4 + 0 + 5 + 566 + 91 = 666.

40556691 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 40556691 - 2¹ = 40556689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (40556591) 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 23 ways as a sum of consecutive naturals, for example, 61 + ... + 9006.

It is an arithmetic number, because the mean of its divisors is an integer number (2829216).

Almost surely, 2^40556691 is an apocalyptic number.

40556691 is a deficient number, since it is larger than the sum of its proper divisors (27344493).

40556691 is a wasteful number, since it uses less digits than its factorization.

40556691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9151 (or 9148 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 40556691 is about 6368.4135387081. The cubic root of 40556691 is about 343.5744326157.

The spelling of 40556691 in words is "forty million, five hundred fifty-six thousand, six hundred ninety-one".