387121687 has 4 divisors (see below), whose sum is σ = 387164016. Its totient is φ = 387079360.

The previous prime is 387121663. The next prime is 387121697. The reversal of 387121687 is 786121783.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 387121687 - 2¹¹ = 387119639 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (387121697) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1114 + ... + 27847.

It is an arithmetic number, because the mean of its divisors is an integer number (96791004).

Almost surely, 2^387121687 is an apocalyptic number.

387121687 is a deficient number, since it is larger than the sum of its proper divisors (42329).

387121687 is a wasteful number, since it uses less digits than its factorization.

387121687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42328.

The product of its digits is 112896, while the sum is 43.

The square root of 387121687 is about 19675.4081787393. The cubic root of 387121687 is about 728.8125355709.

The spelling of 387121687 in words is "three hundred eighty-seven million, one hundred twenty-one thousand, six hundred eighty-seven".