40305689 has 8 divisors (see below), whose sum is σ = 41164032. Its totient is φ = 39453840.

The previous prime is 40305667. The next prime is 40305701. The reversal of 40305689 is 98650304.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40305689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40305619) 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, 12122 + ... + 15084.

It is an arithmetic number, because the mean of its divisors is an integer number (5145504).

Almost surely, 2^40305689 is an apocalyptic number.

It is an amenable number.

40305689 is a deficient number, since it is larger than the sum of its proper divisors (858343).

40305689 is a wasteful number, since it uses less digits than its factorization.

40305689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3247.

The product of its (nonzero) digits is 25920, while the sum is 35.

The square root of 40305689 is about 6348.6761612166. The cubic root of 40305689 is about 342.8641807996.

The spelling of 40305689 in words is "forty million, three hundred five thousand, six hundred eighty-nine".