1984198855 has 4 divisors (see below), whose sum is σ = 2381038632. Its totient is φ = 1587359080.

The previous prime is 1984198849. The next prime is 1984198871. The reversal of 1984198855 is 5588914891.

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

It is not a de Polignac number, because 1984198855 - 2³ = 1984198847 is a prime.

It is a super-2 number, since 2×1984198855² = 7874090192366622050, which contains 22 as substring.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1984198855.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 198419881 + ... + 198419890.

It is an arithmetic number, because the mean of its divisors is an integer number (595259658).

Almost surely, 2^1984198855 is an apocalyptic number.

1984198855 is a deficient number, since it is larger than the sum of its proper divisors (396839777).

1984198855 is an equidigital number, since it uses as much as digits as its factorization.

1984198855 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396839776.

The product of its digits is 4147200, while the sum is 58.

The square root of 1984198855 is about 44544.3470599806. The cubic root of 1984198855 is about 1256.5942406864.

The spelling of 1984198855 in words is "one billion, nine hundred eighty-four million, one hundred ninety-eight thousand, eight hundred fifty-five".