398652409 has 2 divisors, whose sum is σ = 398652410. Its totient is φ = 398652408.

The previous prime is 398652347. The next prime is 398652413. The reversal of 398652409 is 904256893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 301196025 + 97456384 = 17355^2 + 9872^2 .

It is a cyclic number.

It is not a de Polignac number, because 398652409 - 2²³ = 390263801 is a prime.

It is not a weakly prime, because it can be changed into another prime (398652469) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199326204 + 199326205.

It is an arithmetic number, because the mean of its divisors is an integer number (199326205).

Almost surely, 2^398652409 is an apocalyptic number.

It is an amenable number.

398652409 is a deficient number, since it is larger than the sum of its proper divisors (1).

398652409 is an equidigital number, since it uses as much as digits as its factorization.

398652409 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 466560, while the sum is 46.

The square root of 398652409 is about 19966.2818020782. The cubic root of 398652409 is about 735.9779408411.

The spelling of 398652409 in words is "three hundred ninety-eight million, six hundred fifty-two thousand, four hundred nine".