398530287 has 20 divisors (see below), whose sum is σ = 603499600. Its totient is φ = 262043424.

The previous prime is 398530283. The next prime is 398530369. The reversal of 398530287 is 782035893.

398530287 is a `hidden beast` number, since 3 + 98 + 530 + 28 + 7 = 666.

It is not a de Polignac number, because 398530287 - 2² = 398530283 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (398530283) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 27787 + ... + 39612.

It is an arithmetic number, because the mean of its divisors is an integer number (30174980).

Almost surely, 2^398530287 is an apocalyptic number.

398530287 is a deficient number, since it is larger than the sum of its proper divisors (204969313).

398530287 is an equidigital number, since it uses as much as digits as its factorization.

398530287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67484 (or 67475 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 398530287 is about 19963.2233619724. The cubic root of 398530287 is about 735.9027807305.

The spelling of 398530287 in words is "three hundred ninety-eight million, five hundred thirty thousand, two hundred eighty-seven".