1999920384 has 216 divisors, whose sum is σ = 7189745472. Its totient is φ = 519413760.

The previous prime is 1999920361. The next prime is 1999920389. The reversal of 1999920384 is 4830299991.

It is a self number, because there is not a number n which added to its sum of digits gives 1999920384.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999920389) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 171772 + ... + 183044.

Almost surely, 2^1999920384 is an apocalyptic number.

1999920384 is a gapful number since it is divisible by the number (14) 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 1999920384, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3594872736).

1999920384 is an abundant number, since it is smaller than the sum of its proper divisors (5189825088).

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

1999920384 is a wasteful number, since it uses less digits than its factorization.

1999920384 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11313 (or 11296 counting only the distinct ones).

The product of its (nonzero) digits is 1259712, while the sum is 54.

The square root of 1999920384 is about 44720.4694071965. The cubic root of 1999920384 is about 1259.9043313606.

The spelling of 1999920384 in words is "one billion, nine hundred ninety-nine million, nine hundred twenty thousand, three hundred eighty-four".