387299720 has 64 divisors (see below), whose sum is σ = 900910080. Its totient is φ = 149734656.

The previous prime is 387299719. The next prime is 387299747. The reversal of 387299720 is 27992783.

It is a super-2 number, since 2×387299720² = 300002146224156800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 246377 + ... + 247943.

It is an arithmetic number, because the mean of its divisors is an integer number (14076720).

Almost surely, 2^387299720 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 387299720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (450455040).

387299720 is an abundant number, since it is smaller than the sum of its proper divisors (513610360).

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

387299720 is a wasteful number, since it uses less digits than its factorization.

387299720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1782 (or 1778 counting only the distinct ones).

The product of its (nonzero) digits is 381024, while the sum is 47.

The square root of 387299720 is about 19679.9319104513. The cubic root of 387299720 is about 728.9242427343.

The spelling of 387299720 in words is "three hundred eighty-seven million, two hundred ninety-nine thousand, seven hundred twenty".