398230531 has 4 divisors (see below), whose sum is σ = 398373064. Its totient is φ = 398088000.

The previous prime is 398230529. The next prime is 398230537. The reversal of 398230531 is 135032893.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 398230531 - 2¹ = 398230529 is a prime.

It is a super-2 number, since 2×398230531² = 317175111641083922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (398230537) 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, 66990 + ... + 72691.

It is an arithmetic number, because the mean of its divisors is an integer number (99593266).

Almost surely, 2^398230531 is an apocalyptic number.

398230531 is a deficient number, since it is larger than the sum of its proper divisors (142533).

398230531 is a wasteful number, since it uses less digits than its factorization.

398230531 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142532.

The product of its (nonzero) digits is 19440, while the sum is 34.

The square root of 398230531 is about 19955.7142442960. The cubic root of 398230531 is about 735.7182304714.

The spelling of 398230531 in words is "three hundred ninety-eight million, two hundred thirty thousand, five hundred thirty-one".