387021487 has 4 divisors (see below), whose sum is σ = 387095760. Its totient is φ = 386947216.

The previous prime is 387021407. The next prime is 387021539. The reversal of 387021487 is 784120783.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-387021487 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 (387021407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 28678 + ... + 39955.

It is an arithmetic number, because the mean of its divisors is an integer number (96773940).

Almost surely, 2^387021487 is an apocalyptic number.

387021487 is a deficient number, since it is larger than the sum of its proper divisors (74273).

387021487 is an equidigital number, since it uses as much as digits as its factorization.

387021487 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 74272.

The product of its (nonzero) digits is 75264, while the sum is 40.

The square root of 387021487 is about 19672.8616881225. The cubic root of 387021487 is about 728.7496498169.

The spelling of 387021487 in words is "three hundred eighty-seven million, twenty-one thousand, four hundred eighty-seven".