406890685 has 32 divisors (see below), whose sum is σ = 509783040. Its totient is φ = 311620608.

The previous prime is 406890661. The next prime is 406890691. The reversal of 406890685 is 586098604.

It is a cyclic number.

It is not a de Polignac number, because 406890685 - 2⁹ = 406890173 is a prime.

It is a Smith number, since the sum of its digits (46) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent 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, 2969937 + ... + 2970073.

It is an arithmetic number, because the mean of its divisors is an integer number (15930720).

Almost surely, 2^406890685 is an apocalyptic number.

It is an amenable number.

406890685 is a deficient number, since it is larger than the sum of its proper divisors (102892355).

406890685 is a wasteful number, since it uses less digits than its factorization.

406890685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 397.

The product of its (nonzero) digits is 414720, while the sum is 46.

The square root of 406890685 is about 20171.5315481993. The cubic root of 406890685 is about 741.0131514388.

The spelling of 406890685 in words is "four hundred six million, eight hundred ninety thousand, six hundred eighty-five".