406216691 has 8 divisors (see below), whose sum is σ = 412597584. Its totient is φ = 399871360.

The previous prime is 406216687. The next prime is 406216703. The reversal of 406216691 is 196612604.

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 406216691 - 2² = 406216687 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406216621) 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, 14615 + ... + 32031.

It is an arithmetic number, because the mean of its divisors is an integer number (51574698).

Almost surely, 2^406216691 is an apocalyptic number.

406216691 is a deficient number, since it is larger than the sum of its proper divisors (6380893).

406216691 is a wasteful number, since it uses less digits than its factorization.

406216691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17781.

The product of its (nonzero) digits is 15552, while the sum is 35.

The square root of 406216691 is about 20154.8180592135. The cubic root of 406216691 is about 740.6037749524.

The spelling of 406216691 in words is "four hundred six million, two hundred sixteen thousand, six hundred ninety-one".