40017779 has 4 divisors (see below), whose sum is σ = 42371784. Its totient is φ = 37663776.

The previous prime is 40017773. The next prime is 40017793. The reversal of 40017779 is 97771004.

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-40017779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40017773) 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, 1176977 + ... + 1177010.

It is an arithmetic number, because the mean of its divisors is an integer number (10592946).

Almost surely, 2^40017779 is an apocalyptic number.

40017779 is a deficient number, since it is larger than the sum of its proper divisors (2354005).

40017779 is a wasteful number, since it uses less digits than its factorization.

40017779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2354004.

The product of its (nonzero) digits is 12348, while the sum is 35.

The square root of 40017779 is about 6325.9607175511. The cubic root of 40017779 is about 342.0458512674.

The spelling of 40017779 in words is "forty million, seventeen thousand, seven hundred seventy-nine".