40005979 has 4 divisors (see below), whose sum is σ = 43083376. Its totient is φ = 36928584.

The previous prime is 40005967. The next prime is 40005989. The reversal of 40005979 is 97950004.

40005979 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 is a cyclic number.

It is not a de Polignac number, because 40005979 - 2⁹ = 40005467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40005989) 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, 1538679 + ... + 1538704.

It is an arithmetic number, because the mean of its divisors is an integer number (10770844).

Almost surely, 2^40005979 is an apocalyptic number.

40005979 is a deficient number, since it is larger than the sum of its proper divisors (3077397).

40005979 is a wasteful number, since it uses less digits than its factorization.

40005979 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3077396.

The product of its (nonzero) digits is 11340, while the sum is 34.

The square root of 40005979 is about 6325.0279841278. The cubic root of 40005979 is about 342.0122283967.

The spelling of 40005979 in words is "forty million, five thousand, nine hundred seventy-nine".