40179779 has 4 divisors (see below), whose sum is σ = 40199184. Its totient is φ = 40160376.

The previous prime is 40179709. The next prime is 40179791. The reversal of 40179779 is 97797104.

It is a happy number.

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 40179779 - 2¹² = 40175683 is a prime.

It is a super-2 number, since 2×40179779² = 3228829280977682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40179709) 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, 6167 + ... + 10880.

It is an arithmetic number, because the mean of its divisors is an integer number (10049796).

Almost surely, 2^40179779 is an apocalyptic number.

40179779 is a deficient number, since it is larger than the sum of its proper divisors (19405).

40179779 is a wasteful number, since it uses less digits than its factorization.

40179779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19404.

The product of its (nonzero) digits is 111132, while the sum is 44.

The square root of 40179779 is about 6338.7521642670. The cubic root of 40179779 is about 342.5067865883.

The spelling of 40179779 in words is "forty million, one hundred seventy-nine thousand, seven hundred seventy-nine".