387991080 has 128 divisors (see below), whose sum is σ = 1315440000. Its totient is φ = 101693952.

The previous prime is 387991069. The next prime is 387991081. The reversal of 387991080 is 80199783.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (387991081) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60676 + ... + 66764.

It is an arithmetic number, because the mean of its divisors is an integer number (10276875).

Almost surely, 2^387991080 is an apocalyptic number.

387991080 is a gapful number since it is divisible by the number (30) 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 387991080, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (657720000).

387991080 is an abundant number, since it is smaller than the sum of its proper divisors (927448920).

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

387991080 is a wasteful number, since it uses less digits than its factorization.

387991080 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6168 (or 6158 counting only the distinct ones).

The product of its (nonzero) digits is 108864, while the sum is 45.

The square root of 387991080 is about 19697.4891800960. The cubic root of 387991080 is about 729.3577136551.

The spelling of 387991080 in words is "three hundred eighty-seven million, nine hundred ninety-one thousand, eighty".