406986889 has 2 divisors, whose sum is σ = 406986890. Its totient is φ = 406986888.

The previous prime is 406986871. The next prime is 406986893. The reversal of 406986889 is 988689604.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 403407225 + 3579664 = 20085^2 + 1892^2 .

It is a cyclic number.

It is not a de Polignac number, because 406986889 - 2¹¹ = 406984841 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (406986809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 203493444 + 203493445.

It is an arithmetic number, because the mean of its divisors is an integer number (203493445).

Almost surely, 2^406986889 is an apocalyptic number.

It is an amenable number.

406986889 is a deficient number, since it is larger than the sum of its proper divisors (1).

406986889 is an equidigital number, since it uses as much as digits as its factorization.

406986889 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5971968, while the sum is 58.

The square root of 406986889 is about 20173.9160551441. The cubic root of 406986889 is about 741.0715478044.

The spelling of 406986889 in words is "four hundred six million, nine hundred eighty-six thousand, eight hundred eighty-nine".