387921 has 8 divisors (see below), whose sum is σ = 520704. Its totient is φ = 256880.

The previous prime is 387917. The next prime is 387953. The reversal of 387921 is 129783.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 387921 - 2² = 387917 is a prime.

It is not an unprimeable number, because it can be changed into a prime (387911) 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 7 ways as a sum of consecutive naturals, for example, 235 + ... + 911.

It is an arithmetic number, because the mean of its divisors is an integer number (65088).

2³⁸⁷⁹²¹ is an apocalyptic number.

It is an amenable number.

387921 is a deficient number, since it is larger than the sum of its proper divisors (132783).

387921 is a wasteful number, since it uses less digits than its factorization.

387921 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 871.

The product of its digits is 3024, while the sum is 30.

The square root of 387921 is about 622.8330434394. The cubic root of 387921 is about 72.9313798156.

The spelling of 387921 in words is "three hundred eighty-seven thousand, nine hundred twenty-one".