398600687 has 2 divisors, whose sum is σ = 398600688. Its totient is φ = 398600686.

The previous prime is 398600633. The next prime is 398600693. The reversal of 398600687 is 786006893.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-398600687 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (398600617) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199300343 + 199300344.

It is an arithmetic number, because the mean of its divisors is an integer number (199300344).

Almost surely, 2^398600687 is an apocalyptic number.

398600687 is a deficient number, since it is larger than the sum of its proper divisors (1).

398600687 is an equidigital number, since it uses as much as digits as its factorization.

398600687 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 47.

The square root of 398600687 is about 19964.9865264167. The cubic root of 398600687 is about 735.9461103571.

The spelling of 398600687 in words is "three hundred ninety-eight million, six hundred thousand, six hundred eighty-seven".