1999948380 has 48 divisors (see below), whose sum is σ = 5616051840. Its totient is φ = 531777088.

The previous prime is 1999948351. The next prime is 1999948393. The reversal of 1999948380 is 838499991.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (60).

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 15 ways as a sum of consecutive naturals, for example, 27210 + ... + 68849.

It is an arithmetic number, because the mean of its divisors is an integer number (117001080).

Almost surely, 2^1999948380 is an apocalyptic number.

1999948380 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1999948380 is an abundant number, since it is smaller than the sum of its proper divisors (3616103460).

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

1999948380 is a wasteful number, since it uses less digits than its factorization.

1999948380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96418 (or 96416 counting only the distinct ones).

The product of its (nonzero) digits is 5038848, while the sum is 60.

The square root of 1999948380 is about 44720.7824171268. The cubic root of 1999948380 is about 1259.9102102808.

The spelling of 1999948380 in words is "one billion, nine hundred ninety-nine million, nine hundred forty-eight thousand, three hundred eighty".