40642859 has 4 divisors (see below), whose sum is σ = 41132616. Its totient is φ = 40153104.

The previous prime is 40642841. The next prime is 40642883. The reversal of 40642859 is 95824604.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-40642859 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40641859) 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, 244754 + ... + 244919.

It is an arithmetic number, because the mean of its divisors is an integer number (10283154).

Almost surely, 2^40642859 is an apocalyptic number.

40642859 is a deficient number, since it is larger than the sum of its proper divisors (489757).

40642859 is an equidigital number, since it uses as much as digits as its factorization.

40642859 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 489756.

The product of its (nonzero) digits is 69120, while the sum is 38.

The square root of 40642859 is about 6375.1752132785. The cubic root of 40642859 is about 343.8175834501.

The spelling of 40642859 in words is "forty million, six hundred forty-two thousand, eight hundred fifty-nine".