921772 has 12 divisors (see below), whose sum is σ = 1634080. Its totient is φ = 454896.

The previous prime is 921761. The next prime is 921779. The reversal of 921772 is 277129.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 921772.

It is not an unprimeable number, because it can be changed into a prime (921779) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1143 + ... + 1774.

2⁹²¹⁷⁷² is an apocalyptic number.

It is an amenable number.

921772 is a deficient number, since it is larger than the sum of its proper divisors (712308).

921772 is a wasteful number, since it uses less digits than its factorization.

921772 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3000 (or 2998 counting only the distinct ones).

The product of its digits is 1764, while the sum is 28.

The square root of 921772 is about 960.0895791539. The cubic root of 921772 is about 97.3212855962.

The spelling of 921772 in words is "nine hundred twenty-one thousand, seven hundred seventy-two".