1618873798 has 4 divisors (see below), whose sum is σ = 2428310700. Its totient is φ = 809436898.

The previous prime is 1618873759. The next prime is 1618873813. The reversal of 1618873798 is 8973788161.

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

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 congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 404718448 + ... + 404718451.

It is an arithmetic number, because the mean of its divisors is an integer number (607077675).

Almost surely, 2^1618873798 is an apocalyptic number.

1618873798 is a deficient number, since it is larger than the sum of its proper divisors (809436902).

1618873798 is an equidigital number, since it uses as much as digits as its factorization.

1618873798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 809436901.

The product of its digits is 4064256, while the sum is 58.

The square root of 1618873798 is about 40235.2308058497. The cubic root of 1618873798 is about 1174.1880729779.

The spelling of 1618873798 in words is "one billion, six hundred eighteen million, eight hundred seventy-three thousand, seven hundred ninety-eight".