387211540 has 12 divisors (see below), whose sum is σ = 813144276. Its totient is φ = 154884608.

The previous prime is 387211519. The next prime is 387211543. The reversal of 387211540 is 45112783.

It can be written as a sum of positive squares in 2 ways, for example, as 144288144 + 242923396 = 12012^2 + 15586^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387211543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9680269 + ... + 9680308.

It is an arithmetic number, because the mean of its divisors is an integer number (67762023).

Almost surely, 2^387211540 is an apocalyptic number.

It is an amenable number.

387211540 is an abundant number, since it is smaller than the sum of its proper divisors (425932736).

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

387211540 is a wasteful number, since it uses less digits than its factorization.

387211540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19360586 (or 19360584 counting only the distinct ones).

The product of its (nonzero) digits is 6720, while the sum is 31.

The square root of 387211540 is about 19677.6914296368. The cubic root of 387211540 is about 728.8689182959.

The spelling of 387211540 in words is "three hundred eighty-seven million, two hundred eleven thousand, five hundred forty".