921897 has 6 divisors (see below), whose sum is σ = 1331642. Its totient is φ = 614592.

The previous prime is 921889. The next prime is 921901. The reversal of 921897 is 798129.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 853776 + 68121 = 924^2 + 261^2 .

It is not a de Polignac number, because 921897 - 2³ = 921889 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (921887) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 51208 + ... + 51225.

2⁹²¹⁸⁹⁷ is an apocalyptic number.

It is an amenable number.

921897 is a deficient number, since it is larger than the sum of its proper divisors (409745).

921897 is a wasteful number, since it uses less digits than its factorization.

921897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102439 (or 102436 counting only the distinct ones).

The product of its digits is 9072, while the sum is 36.

The square root of 921897 is about 960.1546750394. The cubic root of 921897 is about 97.3256845911.

The spelling of 921897 in words is "nine hundred twenty-one thousand, eight hundred ninety-seven".