1943398680 has 128 divisors (see below), whose sum is σ = 6042193920. Its totient is φ = 499530240.

The previous prime is 1943398661. The next prime is 1943398697. The reversal of 1943398680 is 868933491.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1089069 + ... + 1090851.

It is an arithmetic number, because the mean of its divisors is an integer number (47204640).

Almost surely, 2^1943398680 is an apocalyptic number.

1943398680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1943398680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3021096960).

1943398680 is an abundant number, since it is smaller than the sum of its proper divisors (4098795240).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1943398680 is a wasteful number, since it uses less digits than its factorization.

1943398680 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2121 (or 2117 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 51.

The square root of 1943398680 is about 44083.9957354140. The cubic root of 1943398680 is about 1247.9215978443.

The spelling of 1943398680 in words is "one billion, nine hundred forty-three million, three hundred ninety-eight thousand, six hundred eighty".