398099521 has 4 divisors (see below), whose sum is σ = 398167344. Its totient is φ = 398031700.

The previous prime is 398099519. The next prime is 398099531. The reversal of 398099521 is 125990893.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 398099521 - 2¹ = 398099519 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398099531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 24175 + ... + 37156.

It is an arithmetic number, because the mean of its divisors is an integer number (99541836).

Almost surely, 2^398099521 is an apocalyptic number.

It is an amenable number.

398099521 is a deficient number, since it is larger than the sum of its proper divisors (67823).

398099521 is an equidigital number, since it uses as much as digits as its factorization.

398099521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67822.

The product of its (nonzero) digits is 174960, while the sum is 46.

The square root of 398099521 is about 19952.4314558402. The cubic root of 398099521 is about 735.6375426875.

The spelling of 398099521 in words is "three hundred ninety-eight million, ninety-nine thousand, five hundred twenty-one".