921375 has 80 divisors (see below), whose sum is σ = 2114112. Its totient is φ = 388800.

The previous prime is 921373. The next prime is 921379. The reversal of 921375 is 573129.

It is not a de Polignac number, because 921375 - 2¹ = 921373 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an Ulam number.

921375 is a lucky number.

It is a zygodrome in base 2.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 921375.

It is not an unprimeable number, because it can be changed into a prime (921373) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 70869 + ... + 70881.

2⁹²¹³⁷⁵ is an apocalyptic number.

921375 is an abundant number, since it is smaller than the sum of its proper divisors (1192737).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

921375 is a wasteful number, since it uses less digits than its factorization.

921375 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47 (or 28 counting only the distinct ones).

The product of its digits is 1890, while the sum is 27.

The square root of 921375 is about 959.8828053466. The cubic root of 921375 is about 97.3073117507.

It can be divided in two parts, 921 and 375, that added together give a 4-th power (1296 = 6⁴).

The spelling of 921375 in words is "nine hundred twenty-one thousand, three hundred seventy-five".