387871505 has 12 divisors (see below), whose sum is σ = 541437300. Its totient is φ = 265968864.

The previous prime is 387871499. The next prime is 387871513. The reversal of 387871505 is 505178783.

It can be written as a sum of positive squares in 2 ways, for example, as 261016336 + 126855169 = 16156^2 + 11263^2 .

It is not a de Polignac number, because 387871505 - 2¹⁸ = 387609361 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 791330 + ... + 791819.

It is an arithmetic number, because the mean of its divisors is an integer number (45119775).

Almost surely, 2^387871505 is an apocalyptic number.

387871505 is a gapful number since it is divisible by the number (35) formed by its first and last digit.

It is an amenable number.

387871505 is a deficient number, since it is larger than the sum of its proper divisors (153565795).

387871505 is a wasteful number, since it uses less digits than its factorization.

387871505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1583168 (or 1583161 counting only the distinct ones).

The product of its (nonzero) digits is 235200, while the sum is 44.

The square root of 387871505 is about 19694.4536608660. The cubic root of 387871505 is about 729.2827790204.

The spelling of 387871505 in words is "three hundred eighty-seven million, eight hundred seventy-one thousand, five hundred five".