406855681 has 8 divisors (see below), whose sum is σ = 414172800. Its totient is φ = 399552720.

The previous prime is 406855643. The next prime is 406855697. The reversal of 406855681 is 186558604.

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

It is a de Polignac number, because none of the positive numbers 2^k-406855681 is a prime.

It is a super-2 number, since 2×406855681² = 331063090323947522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (406855081) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (5) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 66760 + ... + 72598.

It is an arithmetic number, because the mean of its divisors is an integer number (51771600).

Almost surely, 2^406855681 is an apocalyptic number.

It is an amenable number.

406855681 is a deficient number, since it is larger than the sum of its proper divisors (7317119).

406855681 is a wasteful number, since it uses less digits than its factorization.

406855681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7079.

The product of its (nonzero) digits is 230400, while the sum is 43.

The square root of 406855681 is about 20170.6638710777. The cubic root of 406855681 is about 740.9919015313.

The spelling of 406855681 in words is "four hundred six million, eight hundred fifty-five thousand, six hundred eighty-one".