406501643 has 2 divisors, whose sum is σ = 406501644. Its totient is φ = 406501642.

The previous prime is 406501631. The next prime is 406501691. The reversal of 406501643 is 346105604.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 406501643 - 2¹⁸ = 406239499 is a prime.

It is not a weakly prime, because it can be changed into another prime (406501243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203250821 + 203250822.

It is an arithmetic number, because the mean of its divisors is an integer number (203250822).

Almost surely, 2^406501643 is an apocalyptic number.

406501643 is a deficient number, since it is larger than the sum of its proper divisors (1).

406501643 is an equidigital number, since it uses as much as digits as its factorization.

406501643 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 406501643 is about 20161.8858988935. The cubic root of 406501643 is about 740.7769068505.

The spelling of 406501643 in words is "four hundred six million, five hundred one thousand, six hundred forty-three".