40079 has 4 divisors (see below), whose sum is σ = 43176. Its totient is φ = 36984.

The previous prime is 40063. The next prime is 40087. The reversal of 40079 is 97004.

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 40079 - 2⁴ = 40063 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 40079.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40009) 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, 1529 + ... + 1554.

It is an arithmetic number, because the mean of its divisors is an integer number (10794).

2⁴⁰⁰⁷⁹ is an apocalyptic number.

40079 is a deficient number, since it is larger than the sum of its proper divisors (3097).

40079 is a wasteful number, since it uses less digits than its factorization.

40079 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3096.

The product of its (nonzero) digits is 252, while the sum is 20.

The square root of 40079 is about 200.1974025806. The cubic root of 40079 is about 34.2220188109. Note that the first 3 decimals are identical.

It can be divided in two parts, 4007 and 9, that multiplied together give a palindrome (36063).

The spelling of 40079 in words is "forty thousand, seventy-nine".