897721444 has 27 divisors (see below), whose sum is σ = 1601038803. Its totient is φ = 440441400.

The previous prime is 897721439. The next prime is 897721453. The reversal of 897721444 is 444127798.

The square root of 897721444 is 29962.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 897721394 and 897721403.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 4254499 + ... + 4254709.

Almost surely, 2^897721444 is an apocalyptic number.

897721444 is the 29962-nd square number.

It is an amenable number.

897721444 is a deficient number, since it is larger than the sum of its proper divisors (703317359).

897721444 is an equidigital number, since it uses as much as digits as its factorization.

897721444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 568 (or 284 counting only the distinct ones).

The product of its digits is 451584, while the sum is 46.

The cubic root of 897721444 is about 964.6739102423.

Multiplying 897721444 by its product of digits (451584), we get a square (405396640567296 = 20134464²).

The spelling of 897721444 in words is "eight hundred ninety-seven million, seven hundred twenty-one thousand, four hundred forty-four".