406788665 has 32 divisors (see below), whose sum is σ = 536315904. Its totient is φ = 294865920.

The previous prime is 406788637. The next prime is 406788671. The reversal of 406788665 is 566887604.

It is a happy number.

It is not a de Polignac number, because 406788665 - 2¹² = 406784569 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 835052 + ... + 835538.

It is an arithmetic number, because the mean of its divisors is an integer number (16759872).

Almost surely, 2^406788665 is an apocalyptic number.

It is an amenable number.

406788665 is a deficient number, since it is larger than the sum of its proper divisors (129527239).

406788665 is a wasteful number, since it uses less digits than its factorization.

406788665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857.

The product of its (nonzero) digits is 1935360, while the sum is 50.

The square root of 406788665 is about 20169.0025782139. The cubic root of 406788665 is about 740.9512146716.

The spelling of 406788665 in words is "four hundred six million, seven hundred eighty-eight thousand, six hundred sixty-five".