387911840 has 48 divisors (see below), whose sum is σ = 926772840. Its totient is φ = 153415680.

The previous prime is 387911833. The next prime is 387911851. The reversal of 387911840 is 48119783.

It can be written as a sum of positive squares in 4 ways, for example, as 362064784 + 25847056 = 19028^2 + 5084^2 .

It is a super-2 number, since 2×387911840² = 300951191224371200, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 620 + ... + 27860.

Almost surely, 2^387911840 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 387911840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (463386420).

387911840 is an abundant number, since it is smaller than the sum of its proper divisors (538861000).

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

387911840 is a wasteful number, since it uses less digits than its factorization.

387911840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27345 (or 27337 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 41.

The square root of 387911840 is about 19695.4776535122. The cubic root of 387911840 is about 729.3080576681.

The spelling of 387911840 in words is "three hundred eighty-seven million, nine hundred eleven thousand, eight hundred forty".