998818378 has 8 divisors (see below), whose sum is σ = 1563367968. Its totient is φ = 477695724.

The previous prime is 998818361. The next prime is 998818393. The reversal of 998818378 is 873818899.

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10856676 + ... + 10856767.

It is an arithmetic number, because the mean of its divisors is an integer number (195420996).

Almost surely, 2^998818378 is an apocalyptic number.

998818378 is a deficient number, since it is larger than the sum of its proper divisors (564549590).

998818378 is a wasteful number, since it uses less digits than its factorization.

998818378 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21713468.

The product of its digits is 6967296, while the sum is 61.

The square root of 998818378 is about 31604.0879950680. The cubic root of 998818378 is about 999.6059707614.

The spelling of 998818378 in words is "nine hundred ninety-eight million, eight hundred eighteen thousand, three hundred seventy-eight".