406618643 has 2 divisors, whose sum is σ = 406618644. Its totient is φ = 406618642.

The previous prime is 406618591. The next prime is 406618651. The reversal of 406618643 is 346816604.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 406618643 - 2¹⁰ = 406617619 is a prime.

It is a super-2 number, since 2×406618643² = 330677441670322898, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 406618597 and 406618606.

It is not a weakly prime, because it can be changed into another prime (406618673) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203309321 + 203309322.

It is an arithmetic number, because the mean of its divisors is an integer number (203309322).

Almost surely, 2^406618643 is an apocalyptic number.

406618643 is a deficient number, since it is larger than the sum of its proper divisors (1).

406618643 is an equidigital number, since it uses as much as digits as its factorization.

406618643 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 82944, while the sum is 38.

The square root of 406618643 is about 20164.7872044314. The cubic root of 406618643 is about 740.8479705930.

The spelling of 406618643 in words is "four hundred six million, six hundred eighteen thousand, six hundred forty-three".