40645689 has 8 divisors (see below), whose sum is σ = 61936320. Its totient is φ = 23226096.

The previous prime is 40645663. The next prime is 40645711. The reversal of 40645689 is 98654604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 40645689 - 2¹² = 40641593 is a prime.

It is a super-3 number, since 3×40645689³ (a number of 24 digits) contains 333 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 40645689.

It is not an unprimeable number, because it can be changed into a prime (40645609) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 967734 + ... + 967775.

It is an arithmetic number, because the mean of its divisors is an integer number (7742040).

Almost surely, 2^40645689 is an apocalyptic number.

It is an amenable number.

40645689 is a deficient number, since it is larger than the sum of its proper divisors (21290631).

40645689 is a wasteful number, since it uses less digits than its factorization.

40645689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1935519.

The product of its (nonzero) digits is 207360, while the sum is 42.

The square root of 40645689 is about 6375.3971640989. The cubic root of 40645689 is about 343.8255633774.

The spelling of 40645689 in words is "forty million, six hundred forty-five thousand, six hundred eighty-nine".