398802317 has 4 divisors (see below), whose sum is σ = 409580796. Its totient is φ = 388023840.

The previous prime is 398802307. The next prime is 398802319. The reversal of 398802317 is 713208893.

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 333208516 + 65593801 = 18254^2 + 8099^2 .

It is a cyclic number.

It is not a de Polignac number, because 398802317 - 2¹⁸ = 398540173 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398802319) 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 in 3 ways as a sum of consecutive naturals, for example, 5389184 + ... + 5389257.

It is an arithmetic number, because the mean of its divisors is an integer number (102395199).

Almost surely, 2^398802317 is an apocalyptic number.

398802317 is a gapful number since it is divisible by the number (37) formed by its first and last digit.

It is an amenable number.

398802317 is a deficient number, since it is larger than the sum of its proper divisors (10778479).

398802317 is a wasteful number, since it uses less digits than its factorization.

398802317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10778478.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 398802317 is about 19970.0354781858. The cubic root of 398802317 is about 736.0701808914.

The spelling of 398802317 in words is "three hundred ninety-eight million, eight hundred two thousand, three hundred seventeen".