398576681 has 2 divisors, whose sum is σ = 398576682. Its totient is φ = 398576680.

The previous prime is 398576671. The next prime is 398576687. The reversal of 398576681 is 186675893.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 370909081 + 27667600 = 19259^2 + 5260^2 .

It is a cyclic number.

It is not a de Polignac number, because 398576681 - 2¹⁴ = 398560297 is a prime.

It is a super-2 number, since 2×398576681² = 317726741273951522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (398576687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199288340 + 199288341.

It is an arithmetic number, because the mean of its divisors is an integer number (199288341).

Almost surely, 2^398576681 is an apocalyptic number.

It is an amenable number.

398576681 is a deficient number, since it is larger than the sum of its proper divisors (1).

398576681 is an equidigital number, since it uses as much as digits as its factorization.

398576681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2177280, while the sum is 53.

The square root of 398576681 is about 19964.3853148551. The cubic root of 398576681 is about 735.9313357739.

The spelling of 398576681 in words is "three hundred ninety-eight million, five hundred seventy-six thousand, six hundred eighty-one".