398560681 has 4 divisors (see below), whose sum is σ = 402669652. Its totient is φ = 394451712.

The previous prime is 398560661. The next prime is 398560691. The reversal of 398560681 is 186065893.

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 331058025 + 67502656 = 18195^2 + 8216^2 .

It is a cyclic number.

It is not a de Polignac number, because 398560681 - 2⁷ = 398560553 is a prime.

It is a super-2 number, since 2×398560681² = 317701232878367522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398560621) 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, 2054340 + ... + 2054533.

It is an arithmetic number, because the mean of its divisors is an integer number (100667413).

Almost surely, 2^398560681 is an apocalyptic number.

It is an amenable number.

398560681 is a deficient number, since it is larger than the sum of its proper divisors (4108971).

398560681 is an equidigital number, since it uses as much as digits as its factorization.

398560681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4108970.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 398560681 is about 19963.9845972692. The cubic root of 398560681 is about 735.9214881841.

The spelling of 398560681 in words is "three hundred ninety-eight million, five hundred sixty thousand, six hundred eighty-one".