40085779 has 8 divisors (see below), whose sum is σ = 42501888. Its totient is φ = 37676160.

The previous prime is 40085767. The next prime is 40085807. The reversal of 40085779 is 97758004.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 40085779 - 2⁷ = 40085651 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40085719) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17934 + ... + 20044.

It is an arithmetic number, because the mean of its divisors is an integer number (5312736).

Almost surely, 2^40085779 is an apocalyptic number.

40085779 is a deficient number, since it is larger than the sum of its proper divisors (2416109).

40085779 is a wasteful number, since it uses less digits than its factorization.

40085779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3245.

The product of its (nonzero) digits is 70560, while the sum is 40.

The square root of 40085779 is about 6331.3331139658. Note that the first 3 decimals coincide. The cubic root of 40085779 is about 342.2394815035.

The spelling of 40085779 in words is "forty million, eighty-five thousand, seven hundred seventy-nine".