1998553858 has 32 divisors (see below), whose sum is σ = 3633696000. Its totient is φ = 805844160.

The previous prime is 1998553831. The next prime is 1998553873. The reversal of 1998553858 is 8583558991.

It is a Harshad number since it is a multiple of its sum of digits (61).

It is a junction number, because it is equal to n+sod(n) for n = 1998553796 and 1998553805.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31233 + ... + 70516.

It is an arithmetic number, because the mean of its divisors is an integer number (113553000).

Almost surely, 2^1998553858 is an apocalyptic number.

1998553858 is a deficient number, since it is larger than the sum of its proper divisors (1635142142).

1998553858 is a wasteful number, since it uses less digits than its factorization.

1998553858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101842.

The product of its digits is 15552000, while the sum is 61.

The square root of 1998553858 is about 44705.1882671352. The cubic root of 1998553858 is about 1259.6173058825.

The spelling of 1998553858 in words is "one billion, nine hundred ninety-eight million, five hundred fifty-three thousand, eight hundred fifty-eight".