387640240 has 80 divisors (see below), whose sum is σ = 994373856. Its totient is φ = 139622400.

The previous prime is 387640217. The next prime is 387640241. The reversal of 387640240 is 42046783.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 387640196 and 387640205.

It is not an unprimeable number, because it can be changed into a prime (387640241) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 38095 + ... + 47185.

Almost surely, 2^387640240 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 387640240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (497186928).

387640240 is an abundant number, since it is smaller than the sum of its proper divisors (606733616).

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

387640240 is a wasteful number, since it uses less digits than its factorization.

387640240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9158 (or 9152 counting only the distinct ones).

The product of its (nonzero) digits is 32256, while the sum is 34.

The square root of 387640240 is about 19688.5814623604. The cubic root of 387640240 is about 729.1378073730.

The spelling of 387640240 in words is "three hundred eighty-seven million, six hundred forty thousand, two hundred forty".