921385 has 8 divisors (see below), whose sum is σ = 1115136. Its totient is φ = 730800.

The previous prime is 921379. The next prime is 921407. The reversal of 921385 is 583129.

921385 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 921385 - 2⁵ = 921353 is a prime.

It is a Duffinian number.

921385 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 91 + ... + 1360.

It is an arithmetic number, because the mean of its divisors is an integer number (139392).

2⁹²¹³⁸⁵ is an apocalyptic number.

It is an amenable number.

921385 is a deficient number, since it is larger than the sum of its proper divisors (193751).

921385 is a wasteful number, since it uses less digits than its factorization.

921385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1583.

The product of its digits is 2160, while the sum is 28.

The square root of 921385 is about 959.8880143017. Note that the first 3 decimals coincide. The cubic root of 921385 is about 97.3076637861.

The spelling of 921385 in words is "nine hundred twenty-one thousand, three hundred eighty-five".