197928819 has 16 divisors (see below), whose sum is σ = 319885440. Its totient is φ = 119956680.

The previous prime is 197928793. The next prime is 197928839. The reversal of 197928819 is 918829791.

It is not a de Polignac number, because 197928819 - 2⁷ = 197928691 is a prime.

It is a super-2 number, since 2×197928819² = 78351634781469522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (197928839) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 332917 + ... + 333510.

It is an arithmetic number, because the mean of its divisors is an integer number (19992840).

Almost surely, 2^197928819 is an apocalyptic number.

197928819 is a deficient number, since it is larger than the sum of its proper divisors (121956621).

197928819 is a wasteful number, since it uses less digits than its factorization.

197928819 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 666447 (or 666441 counting only the distinct ones).

The product of its digits is 653184, while the sum is 54.

The square root of 197928819 is about 14068.7177454095. The cubic root of 197928819 is about 582.7778153748. Note that the first 3 decimals are identical.

The spelling of 197928819 in words is "one hundred ninety-seven million, nine hundred twenty-eight thousand, eight hundred nineteen".