197821369 has 4 divisors (see below), whose sum is σ = 208233040. Its totient is φ = 187409700.

The previous prime is 197821361. The next prime is 197821373. The reversal of 197821369 is 963128791.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 197821369 - 2³ = 197821361 is a prime.

It is a super-2 number, since 2×197821369² = 78266588066068322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (197821361) 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, 5205807 + ... + 5205844.

It is an arithmetic number, because the mean of its divisors is an integer number (52058260).

Almost surely, 2^197821369 is an apocalyptic number.

197821369 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

197821369 is a deficient number, since it is larger than the sum of its proper divisors (10411671).

197821369 is a wasteful number, since it uses less digits than its factorization.

197821369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10411670.

The product of its digits is 163296, while the sum is 46.

The square root of 197821369 is about 14064.8984710164. The cubic root of 197821369 is about 582.6723383799.

The spelling of 197821369 in words is "one hundred ninety-seven million, eight hundred twenty-one thousand, three hundred sixty-nine".