408287989 has 2 divisors, whose sum is σ = 408287990. Its totient is φ = 408287988.

The previous prime is 408287959. The next prime is 408288043. The reversal of 408287989 is 989782804.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 249956100 + 158331889 = 15810^2 + 12583^2 .

It is a cyclic number.

It is not a de Polignac number, because 408287989 - 2¹⁹ = 407763701 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (408287959) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 204143994 + 204143995.

It is an arithmetic number, because the mean of its divisors is an integer number (204143995).

Almost surely, 2^408287989 is an apocalyptic number.

It is an amenable number.

408287989 is a deficient number, since it is larger than the sum of its proper divisors (1).

408287989 is an equidigital number, since it uses as much as digits as its factorization.

408287989 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 2322432, while the sum is 55.

The square root of 408287989 is about 20206.1374092131. The cubic root of 408287989 is about 741.8604204869.

The spelling of 408287989 in words is "four hundred eight million, two hundred eighty-seven thousand, nine hundred eighty-nine".