40678993 has 4 divisors (see below), whose sum is σ = 40715428. Its totient is φ = 40642560.

The previous prime is 40678961. The next prime is 40679033. The reversal of 40678993 is 39987604.

40678993 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 19775809 + 20903184 = 4447^2 + 4572^2 .

It is a cyclic number.

It is not a de Polignac number, because 40678993 - 2⁵ = 40678961 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40078993) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16488 + ... + 18793.

It is an arithmetic number, because the mean of its divisors is an integer number (10178857).

Almost surely, 2^40678993 is an apocalyptic number.

It is an amenable number.

40678993 is a deficient number, since it is larger than the sum of its proper divisors (36435).

40678993 is a wasteful number, since it uses less digits than its factorization.

40678993 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36434.

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 40678993 is about 6378.0085449927. The cubic root of 40678993 is about 343.9194449245.

The spelling of 40678993 in words is "forty million, six hundred seventy-eight thousand, nine hundred ninety-three".