398632417 has 4 divisors (see below), whose sum is σ = 399505156. Its totient is φ = 397759680.

The previous prime is 398632393. The next prime is 398632447. The reversal of 398632417 is 714236893.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 309443281 + 89189136 = 17591^2 + 9444^2 .

It is a cyclic number.

It is not a de Polignac number, because 398632417 - 2¹⁹ = 398108129 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398632447) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 435684 + ... + 436597.

It is an arithmetic number, because the mean of its divisors is an integer number (99876289).

Almost surely, 2^398632417 is an apocalyptic number.

It is an amenable number.

398632417 is a deficient number, since it is larger than the sum of its proper divisors (872739).

398632417 is an equidigital number, since it uses as much as digits as its factorization.

398632417 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 872738.

The product of its digits is 217728, while the sum is 43.

The square root of 398632417 is about 19965.7811517606. The cubic root of 398632417 is about 735.9656377950.

The spelling of 398632417 in words is "three hundred ninety-eight million, six hundred thirty-two thousand, four hundred seventeen".