398441521 has 3 divisors (see below), whose sum is σ = 398461483. Its totient is φ = 398421560.

The previous prime is 398441473. The next prime is 398441531. The reversal of 398441521 is 125144893.

The square root of 398441521 is 19961.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in only one way, i.e., 370139121 + 28302400 = 19239^2 + 5320^2 .

It is not a de Polignac number, because 398441521 - 2⁹ = 398441009 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398441531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 9981 + ... + 29941.

Almost surely, 2^398441521 is an apocalyptic number.

398441521 is the 19961-st square number.

398441521 is the 9981-st centered octagonal number.

It is an amenable number.

398441521 is a deficient number, since it is larger than the sum of its proper divisors (19962).

398441521 is an frugal number, since it uses more digits than its factorization.

398441521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39922 (or 19961 counting only the distinct ones).

The product of its digits is 34560, while the sum is 37.

The cubic root of 398441521 is about 735.8481399677.

The spelling of 398441521 in words is "three hundred ninety-eight million, four hundred forty-one thousand, five hundred twenty-one".