398732281 has 8 divisors (see below), whose sum is σ = 414289800. Its totient is φ = 383295360.

The previous prime is 398732221. The next prime is 398732287. The reversal of 398732281 is 182237893.

It can be written as a sum of positive squares in 4 ways, for example, as 297045225 + 101687056 = 17235^2 + 10084^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 398732281 - 2¹³ = 398724089 is a prime.

It is a super-2 number, since 2×398732281² = 317974863822925922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398732287) 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 7 ways as a sum of consecutive naturals, for example, 23380 + ... + 36661.

It is an arithmetic number, because the mean of its divisors is an integer number (51786225).

Almost surely, 2^398732281 is an apocalyptic number.

It is an amenable number.

398732281 is a deficient number, since it is larger than the sum of its proper divisors (15557519).

398732281 is a wasteful number, since it uses less digits than its factorization.

398732281 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 60299.

The product of its digits is 145152, while the sum is 43.

The square root of 398732281 is about 19968.2818740121. The cubic root of 398732281 is about 736.0270898435.

The spelling of 398732281 in words is "three hundred ninety-eight million, seven hundred thirty-two thousand, two hundred eighty-one".