40644609 has 16 divisors (see below), whose sum is σ = 55157760. Its totient is φ = 26618240.

The previous prime is 40644601. The next prime is 40644619. The reversal of 40644609 is 90644604.

It is a cyclic number.

It is not a de Polignac number, because 40644609 - 2³ = 40644601 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 40644609.

It is not an unprimeable number, because it can be changed into a prime (40644601) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 50599 + ... + 51395.

It is an arithmetic number, because the mean of its divisors is an integer number (3447360).

Almost surely, 2^40644609 is an apocalyptic number.

It is an amenable number.

40644609 is a deficient number, since it is larger than the sum of its proper divisors (14513151).

40644609 is a wasteful number, since it uses less digits than its factorization.

40644609 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1080.

The product of its (nonzero) digits is 20736, while the sum is 33.

The square root of 40644609 is about 6375.3124629307. The cubic root of 40644609 is about 343.8225180778.

The spelling of 40644609 in words is "forty million, six hundred forty-four thousand, six hundred nine".