998975487 has 4 divisors (see below), whose sum is σ = 1331967320. Its totient is φ = 665983656.

The previous prime is 998975479. The next prime is 998975489. The reversal of 998975487 is 784579899.

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

It is not a de Polignac number, because 998975487 - 2³ = 998975479 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 (998975489) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166495912 + ... + 166495917.

It is an arithmetic number, because the mean of its divisors is an integer number (332991830).

Almost surely, 2^998975487 is an apocalyptic number.

998975487 is a deficient number, since it is larger than the sum of its proper divisors (332991833).

998975487 is a wasteful number, since it uses less digits than its factorization.

998975487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 332991832.

The product of its digits is 45722880, while the sum is 66.

The square root of 998975487 is about 31606.5734776802. The cubic root of 998975487 is about 999.6583789750.

The spelling of 998975487 in words is "nine hundred ninety-eight million, nine hundred seventy-five thousand, four hundred eighty-seven".