387990 has 40 divisors (see below), whose sum is σ = 1045440. Its totient is φ = 103248.

The previous prime is 387977. The next prime is 388009. The reversal of 387990 is 99783.

It is a plaindrome in base 11.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 571 + ... + 1049.

It is an arithmetic number, because the mean of its divisors is an integer number (26136).

2³⁸⁷⁹⁹⁰ is an apocalyptic number.

387990 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 387990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (522720).

387990 is an abundant number, since it is smaller than the sum of its proper divisors (657450).

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

387990 is a wasteful number, since it uses less digits than its factorization.

387990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 498 (or 489 counting only the distinct ones).

The product of its (nonzero) digits is 13608, while the sum is 36.

The square root of 387990 is about 622.8884330279. Note that the first 3 decimals coincide. The cubic root of 387990 is about 72.9357036915.

It can be divided in two parts, 3879 and 90, that added together give a square (3969 = 63²).

The spelling of 387990 in words is "three hundred eighty-seven thousand, nine hundred ninety".