40656645 has 36 divisors (see below), whose sum is σ = 72178860. Its totient is φ = 21170304.

The previous prime is 40656643. The next prime is 40656653. The reversal of 40656645 is 54665604.

It is a happy number.

40656645 is a `hidden beast` number, since 4 + 0 + 6 + 5 + 6 + 645 = 666.

40656645 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 27217089 + 13439556 = 5217^2 + 3666^2 .

It is not a de Polignac number, because 40656645 - 2¹ = 40656643 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40656643) 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 35 ways as a sum of consecutive naturals, for example, 99201 + ... + 99609.

Almost surely, 2^40656645 is an apocalyptic number.

40656645 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

40656645 is a deficient number, since it is larger than the sum of its proper divisors (31522215).

40656645 is a wasteful number, since it uses less digits than its factorization.

40656645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 514 (or 464 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 36.

The square root of 40656645 is about 6376.2563467916. The cubic root of 40656645 is about 343.8564532008.

The spelling of 40656645 in words is "forty million, six hundred fifty-six thousand, six hundred forty-five".