998491507 has 16 divisors (see below), whose sum is σ = 1093962240. Its totient is φ = 905797152.

The previous prime is 998491499. The next prime is 998491511. The reversal of 998491507 is 705194899.

It is not a de Polignac number, because 998491507 - 2³ = 998491499 is a prime.

It is a super-2 number, since 2×998491507² = 1993970579102262098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (998431507) 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 15 ways as a sum of consecutive naturals, for example, 230988 + ... + 235270.

It is an arithmetic number, because the mean of its divisors is an integer number (68372640).

Almost surely, 2^998491507 is an apocalyptic number.

998491507 is a deficient number, since it is larger than the sum of its proper divisors (95470733).

998491507 is a wasteful number, since it uses less digits than its factorization.

998491507 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4602.

The product of its (nonzero) digits is 816480, while the sum is 52.

The square root of 998491507 is about 31598.9162314153. The cubic root of 998491507 is about 999.4969159489.

The spelling of 998491507 in words is "nine hundred ninety-eight million, four hundred ninety-one thousand, five hundred seven".