40806645 has 24 divisors (see below), whose sum is σ = 71768928. Its totient is φ = 19784160.

The previous prime is 40806641. The next prime is 40806653. The reversal of 40806645 is 54660804.

It is a happy number.

It is not a de Polignac number, because 40806645 - 2² = 40806641 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40806641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9427 + ... + 13056.

It is an arithmetic number, because the mean of its divisors is an integer number (2990372).

Almost surely, 2^40806645 is an apocalyptic number.

It is an amenable number.

40806645 is a deficient number, since it is larger than the sum of its proper divisors (30962283).

40806645 is a wasteful number, since it uses less digits than its factorization.

40806645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22513 (or 22502 counting only the distinct ones).

The product of its (nonzero) digits is 23040, while the sum is 33.

The square root of 40806645 is about 6388.0079054428. The cubic root of 40806645 is about 344.2788127428.

The spelling of 40806645 in words is "forty million, eight hundred six thousand, six hundred forty-five".