40665779 has 8 divisors (see below), whose sum is σ = 50700288. Its totient is φ = 31687560.

The previous prime is 40665773. The next prime is 40665797. The reversal of 40665779 is 97756604.

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 40665779 - 2⁸ = 40665523 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (40665773) 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, 263987 + ... + 264140.

It is an arithmetic number, because the mean of its divisors is an integer number (6337536).

Almost surely, 2^40665779 is an apocalyptic number.

40665779 is a deficient number, since it is larger than the sum of its proper divisors (10034509).

40665779 is a wasteful number, since it uses less digits than its factorization.

40665779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 528145.

The product of its (nonzero) digits is 317520, while the sum is 44.

The square root of 40665779 is about 6376.9725575699. The cubic root of 40665779 is about 343.8822017565.

The spelling of 40665779 in words is "forty million, six hundred sixty-five thousand, seven hundred seventy-nine".