406995689 has 2 divisors, whose sum is σ = 406995690. Its totient is φ = 406995688.

The previous prime is 406995619. The next prime is 406995697. The reversal of 406995689 is 986599604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 350625625 + 56370064 = 18725^2 + 7508^2 .

It is a cyclic number.

It is not a de Polignac number, because 406995689 - 2¹² = 406991593 is a prime.

It is not a weakly prime, because it can be changed into another prime (406995619) 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, 203497844 + 203497845.

It is an arithmetic number, because the mean of its divisors is an integer number (203497845).

Almost surely, 2^406995689 is an apocalyptic number.

It is an amenable number.

406995689 is a deficient number, since it is larger than the sum of its proper divisors (1).

406995689 is an equidigital number, since it uses as much as digits as its factorization.

406995689 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4199040, while the sum is 56.

The square root of 406995689 is about 20174.1341573808. The cubic root of 406995689 is about 741.0768889941.

The spelling of 406995689 in words is "four hundred six million, nine hundred ninety-five thousand, six hundred eighty-nine".