921864 has 32 divisors (see below), whose sum is σ = 2341440. Its totient is φ = 302400.

The previous prime is 921841. The next prime is 921871. The reversal of 921864 is 468129.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 921864.

It is an unprimeable number.

921864 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1434 + ... + 1974.

It is an arithmetic number, because the mean of its divisors is an integer number (73170).

2⁹²¹⁸⁶⁴ is an apocalyptic number.

It is an amenable number.

921864 is an abundant number, since it is smaller than the sum of its proper divisors (1419576).

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

921864 is a wasteful number, since it uses less digits than its factorization.

921864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621 (or 617 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 921864 is about 960.1374901544. The cubic root of 921864 is about 97.3245232951.

The spelling of 921864 in words is "nine hundred twenty-one thousand, eight hundred sixty-four".