197874889 has 2 divisors, whose sum is σ = 197874890. Its totient is φ = 197874888.

The previous prime is 197874881. The next prime is 197874893. The reversal of 197874889 is 988478791.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 139428864 + 58446025 = 11808^2 + 7645^2 .

It is a cyclic number.

It is not a de Polignac number, because 197874889 - 2³ = 197874881 is a prime.

It is not a weakly prime, because it can be changed into another prime (197874881) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98937444 + 98937445.

It is an arithmetic number, because the mean of its divisors is an integer number (98937445).

Almost surely, 2^197874889 is an apocalyptic number.

It is an amenable number.

197874889 is a deficient number, since it is larger than the sum of its proper divisors (1).

197874889 is an equidigital number, since it uses as much as digits as its factorization.

197874889 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 8128512, while the sum is 61.

The square root of 197874889 is about 14066.8009511758. The cubic root of 197874889 is about 582.7248804145.

It can be divided in two parts, 1978 and 74889, that added together give a palindrome (76867).

The spelling of 197874889 in words is "one hundred ninety-seven million, eight hundred seventy-four thousand, eight hundred eighty-nine".