998098857 has 24 divisors (see below), whose sum is σ = 1649733696. Its totient is φ = 569622816.

The previous prime is 998098853. The next prime is 998098859. The reversal of 998098857 is 758890899.

It is not a de Polignac number, because 998098857 - 2² = 998098853 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a junction number, because it is equal to n+sod(n) for n = 998098794 and 998098803.

It is not an unprimeable number, because it can be changed into a prime (998098853) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42523 + ... + 61679.

It is an arithmetic number, because the mean of its divisors is an integer number (68738904).

Almost surely, 2^998098857 is an apocalyptic number.

It is an amenable number.

998098857 is a deficient number, since it is larger than the sum of its proper divisors (651634839).

998098857 is a wasteful number, since it uses less digits than its factorization.

998098857 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19997 (or 19994 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 63.

The square root of 998098857 is about 31592.7025909465. The cubic root of 998098857 is about 999.3658836481.

The spelling of 998098857 in words is "nine hundred ninety-eight million, ninety-eight thousand, eight hundred fifty-seven".