406666619 has 2 divisors, whose sum is σ = 406666620. Its totient is φ = 406666618.

The previous prime is 406666613. The next prime is 406666651. The reversal of 406666619 is 916666604.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-406666619 is a prime.

It is a super-2 number, since 2×406666619² = 330755478017782322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 406666619.

It is not a weakly prime, because it can be changed into another prime (406666613) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203333309 + 203333310.

It is an arithmetic number, because the mean of its divisors is an integer number (203333310).

Almost surely, 2^406666619 is an apocalyptic number.

406666619 is a deficient number, since it is larger than the sum of its proper divisors (1).

406666619 is an equidigital number, since it uses as much as digits as its factorization.

406666619 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 279936, while the sum is 44.

The square root of 406666619 is about 20165.9767678137. The cubic root of 406666619 is about 740.8771064307.

The spelling of 406666619 in words is "four hundred six million, six hundred sixty-six thousand, six hundred nineteen".