406866689 has 8 divisors (see below), whose sum is σ = 418136040. Its totient is φ = 395611776.

The previous prime is 406866673. The next prime is 406866721. The reversal of 406866689 is 986668604.

It can be written as a sum of positive squares in 4 ways, for example, as 213656689 + 193210000 = 14617^2 + 13900^2 .

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 406866689 - 2⁴ = 406866673 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 406866689.

It is not an unprimeable number, because it can be changed into a prime (406860689) 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, 79397 + ... + 84365.

It is an arithmetic number, because the mean of its divisors is an integer number (52267005).

Almost surely, 2^406866689 is an apocalyptic number.

It is an amenable number.

406866689 is a deficient number, since it is larger than the sum of its proper divisors (11269351).

406866689 is a wasteful number, since it uses less digits than its factorization.

406866689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7219.

The product of its (nonzero) digits is 2985984, while the sum is 53.

The square root of 406866689 is about 20170.9367407664. The cubic root of 406866689 is about 740.9985842985.

The spelling of 406866689 in words is "four hundred six million, eight hundred sixty-six thousand, six hundred eighty-nine".