406697989 has 2 divisors, whose sum is σ = 406697990. Its totient is φ = 406697988.

The previous prime is 406697971. The next prime is 406698031. The reversal of 406697989 is 989796604.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 405216900 + 1481089 = 20130^2 + 1217^2 .

It is a cyclic number.

It is not a de Polignac number, because 406697989 - 2⁵ = 406697957 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (406698989) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203348994 + 203348995.

It is an arithmetic number, because the mean of its divisors is an integer number (203348995).

Almost surely, 2^406697989 is an apocalyptic number.

It is an amenable number.

406697989 is a deficient number, since it is larger than the sum of its proper divisors (1).

406697989 is an equidigital number, since it uses as much as digits as its factorization.

406697989 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5878656, while the sum is 58.

The square root of 406697989 is about 20166.7545480179. The cubic root of 406697989 is about 740.8961562012.

The spelling of 406697989 in words is "four hundred six million, six hundred ninety-seven thousand, nine hundred eighty-nine".