1999037880 has 320 divisors, whose sum is σ = 8084736000. Its totient is φ = 432781056.

The previous prime is 1999037839. The next prime is 1999037881. The reversal of 1999037880 is 887309991.

1999037880 is a `hidden beast` number, since 199 + 9 + 0 + 378 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1999037881) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 428601 + ... + 433239.

It is an arithmetic number, because the mean of its divisors is an integer number (25264800).

Almost surely, 2^1999037880 is an apocalyptic number.

1999037880 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 1999037880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (4042368000).

1999037880 is an abundant number, since it is smaller than the sum of its proper divisors (6085698120).

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

1999037880 is a wasteful number, since it uses less digits than its factorization.

1999037880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4688 (or 4675 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 54.

The square root of 1999037880 is about 44710.6014274020. The cubic root of 1999037880 is about 1259.7189849495.

The spelling of 1999037880 in words is "one billion, nine hundred ninety-nine million, thirty-seven thousand, eight hundred eighty".