406866691 has 8 divisors (see below), whose sum is σ = 507262464. Its totient is φ = 317038920.

The previous prime is 406866673. The next prime is 406866721. The reversal of 406866691 is 196668604.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 406866691 - 2²³ = 398478083 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406866611) 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, 2641915 + ... + 2642068.

It is an arithmetic number, because the mean of its divisors is an integer number (63407808).

Almost surely, 2^406866691 is an apocalyptic number.

406866691 is a deficient number, since it is larger than the sum of its proper divisors (100395773).

406866691 is a wasteful number, since it uses less digits than its factorization.

406866691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5284001.

The product of its (nonzero) digits is 373248, while the sum is 46.

The square root of 406866691 is about 20170.9367903427. The cubic root of 406866691 is about 740.9985855126.

The spelling of 406866691 in words is "four hundred six million, eight hundred sixty-six thousand, six hundred ninety-one".