897838221 has 24 divisors (see below), whose sum is σ = 1474485120. Its totient is φ = 482869632.

The previous prime is 897838171. The next prime is 897838241. The reversal of 897838221 is 122838798.

It is not a de Polignac number, because 897838221 - 2⁶ = 897838157 is a prime.

It is a super-2 number, since 2×897838221² = 1612226942176889682, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (897838241) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 177141 + ... + 182138.

It is an arithmetic number, because the mean of its divisors is an integer number (61436880).

Almost surely, 2^897838221 is an apocalyptic number.

It is an amenable number.

897838221 is a deficient number, since it is larger than the sum of its proper divisors (576646899).

897838221 is a wasteful number, since it uses less digits than its factorization.

897838221 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359313 (or 359306 counting only the distinct ones).

The product of its digits is 387072, while the sum is 48.

The square root of 897838221 is about 29963.9486883822. The cubic root of 897838221 is about 964.7157371890.

The spelling of 897838221 in words is "eight hundred ninety-seven million, eight hundred thirty-eight thousand, two hundred twenty-one".