1391984998 has 8 divisors (see below), whose sum is σ = 2088136008. Its totient is φ = 695939664.

The previous prime is 1391984989. The next prime is 1391985013. The reversal of 1391984998 is 8994891931.

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

It is a congruent number.

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, 36165 + ... + 63967.

It is an arithmetic number, because the mean of its divisors is an integer number (261017001).

Almost surely, 2^1391984998 is an apocalyptic number.

1391984998 is a deficient number, since it is larger than the sum of its proper divisors (696151010).

1391984998 is a wasteful number, since it uses less digits than its factorization.

1391984998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52838.

The product of its digits is 5038848, while the sum is 61.

The square root of 1391984998 is about 37309.3151639105. The cubic root of 1391984998 is about 1116.5500231718.

The spelling of 1391984998 in words is "one billion, three hundred ninety-one million, nine hundred eighty-four thousand, nine hundred ninety-eight".