406855643 has 2 divisors, whose sum is σ = 406855644. Its totient is φ = 406855642.

The previous prime is 406855639. The next prime is 406855697. The reversal of 406855643 is 346558604.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 406855643 - 2² = 406855639 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 406855643.

It is not a weakly prime, because it can be changed into another prime (406855633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203427821 + 203427822.

It is an arithmetic number, because the mean of its divisors is an integer number (203427822).

Almost surely, 2^406855643 is an apocalyptic number.

406855643 is a deficient number, since it is larger than the sum of its proper divisors (1).

406855643 is an equidigital number, since it uses as much as digits as its factorization.

406855643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 345600, while the sum is 41.

The square root of 406855643 is about 20170.6629291156. The cubic root of 406855643 is about 740.9918784620.

The spelling of 406855643 in words is "four hundred six million, eight hundred fifty-five thousand, six hundred forty-three".