387021860 has 12 divisors (see below), whose sum is σ = 812745948. Its totient is φ = 154808736.

The previous prime is 387021853. The next prime is 387021913. The reversal of 387021860 is 68120783.

It can be written as a sum of positive squares in 2 ways, for example, as 86415616 + 300606244 = 9296^2 + 17338^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 387021860.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9675527 + ... + 9675566.

It is an arithmetic number, because the mean of its divisors is an integer number (67728829).

Almost surely, 2^387021860 is an apocalyptic number.

It is an amenable number.

387021860 is an abundant number, since it is smaller than the sum of its proper divisors (425724088).

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

387021860 is a wasteful number, since it uses less digits than its factorization.

387021860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19351102 (or 19351100 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 387021860 is about 19672.8711681849. The cubic root of 387021860 is about 728.7498839327.

The spelling of 387021860 in words is "three hundred eighty-seven million, twenty-one thousand, eight hundred sixty".