1998378358 has 24 divisors (see below), whose sum is σ = 3140032824. Its totient is φ = 953644320.

The previous prime is 1998378353. The next prime is 1998378433. The reversal of 1998378358 is 8538738991.

It is a junction number, because it is equal to n+sod(n) for n = 1998378296 and 1998378305.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1998378353) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 133185 + ... + 147427.

It is an arithmetic number, because the mean of its divisors is an integer number (130834701).

Almost surely, 2^1998378358 is an apocalyptic number.

1998378358 is a deficient number, since it is larger than the sum of its proper divisors (1141654466).

1998378358 is a wasteful number, since it uses less digits than its factorization.

1998378358 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14380 (or 14349 counting only the distinct ones).

The product of its digits is 13063680, while the sum is 61.

The square root of 1998378358 is about 44703.2253646199. The cubic root of 1998378358 is about 1259.5804343370.

The spelling of 1998378358 in words is "one billion, nine hundred ninety-eight million, three hundred seventy-eight thousand, three hundred fifty-eight".