40643459 has 4 divisors (see below), whose sum is σ = 40676280. Its totient is φ = 40610640.

The previous prime is 40643443. The next prime is 40643483. The reversal of 40643459 is 95434604.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 40643459 - 2⁴ = 40643443 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40643359) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14477 + ... + 17054.

It is an arithmetic number, because the mean of its divisors is an integer number (10169070).

Almost surely, 2^40643459 is an apocalyptic number.

40643459 is a deficient number, since it is larger than the sum of its proper divisors (32821).

40643459 is a wasteful number, since it uses less digits than its factorization.

40643459 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32820.

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 40643459 is about 6375.2222706350. Note that the first 4 decimals coincide. The cubic root of 40643459 is about 343.8192753384.

The spelling of 40643459 in words is "forty million, six hundred forty-three thousand, four hundred fifty-nine".