398300521 has 2 divisors, whose sum is σ = 398300522. Its totient is φ = 398300520.

The previous prime is 398300519. The next prime is 398300533. The reversal of 398300521 is 125003893.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 358155625 + 40144896 = 18925^2 + 6336^2 .

It is a cyclic number.

It is not a de Polignac number, because 398300521 - 2¹ = 398300519 is a prime.

Together with 398300519, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (398300501) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 199150260 + 199150261.

It is an arithmetic number, because the mean of its divisors is an integer number (199150261).

Almost surely, 2^398300521 is an apocalyptic number.

It is an amenable number.

398300521 is a deficient number, since it is larger than the sum of its proper divisors (1).

398300521 is an equidigital number, since it uses as much as digits as its factorization.

398300521 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 398300521 is about 19957.4678002997. The cubic root of 398300521 is about 735.7613293790.

The spelling of 398300521 in words is "three hundred ninety-eight million, three hundred thousand, five hundred twenty-one".