1988991343 has 8 divisors (see below), whose sum is σ = 2009150000. Its totient is φ = 1968867648.

The previous prime is 1988991317. The next prime is 1988991349. The reversal of 1988991343 is 3431998891.

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

It is a cyclic number.

It is not a de Polignac number, because 1988991343 - 2⁵ = 1988991311 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1988991349) 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 7 ways as a sum of consecutive naturals, for example, 114283 + ... + 130531.

It is an arithmetic number, because the mean of its divisors is an integer number (251143750).

Almost surely, 2^1988991343 is an apocalyptic number.

1988991343 is a deficient number, since it is larger than the sum of its proper divisors (20158657).

1988991343 is a wasteful number, since it uses less digits than its factorization.

1988991343 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17481.

The product of its digits is 1679616, while the sum is 55.

The square root of 1988991343 is about 44598.1091863769. The cubic root of 1988991343 is about 1257.6051223601.

The spelling of 1988991343 in words is "one billion, nine hundred eighty-eight million, nine hundred ninety-one thousand, three hundred forty-three".