406660785 has 16 divisors (see below), whose sum is σ = 662935104. Its totient is φ = 212793152.

The previous prime is 406660729. The next prime is 406660829. The reversal of 406660785 is 587066604.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 406660785 - 2¹¹ = 406658737 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 254967 + ... + 256556.

It is an arithmetic number, because the mean of its divisors is an integer number (41433444).

Almost surely, 2^406660785 is an apocalyptic number.

It is an amenable number.

406660785 is a deficient number, since it is larger than the sum of its proper divisors (256274319).

406660785 is a wasteful number, since it uses less digits than its factorization.

406660785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 511584.

The product of its (nonzero) digits is 241920, while the sum is 42.

The square root of 406660785 is about 20165.8321177183. The cubic root of 406660785 is about 740.8735635633.

The spelling of 406660785 in words is "four hundred six million, six hundred sixty thousand, seven hundred eighty-five".