199597489 has 32 divisors (see below), whose sum is σ = 262599680. Its totient is φ = 147292992.

The previous prime is 199597477. The next prime is 199597507. The reversal of 199597489 is 984795991.

It is not a de Polignac number, because 199597489 - 2⁵ = 199597457 is a prime.

It is not an unprimeable number, because it can be changed into a prime (199597439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 114982 + ... + 116704.

It is an arithmetic number, because the mean of its divisors is an integer number (8206240).

Almost surely, 2^199597489 is an apocalyptic number.

199597489 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

199597489 is a deficient number, since it is larger than the sum of its proper divisors (63002191).

199597489 is a wasteful number, since it uses less digits than its factorization.

199597489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1829.

The product of its digits is 7348320, while the sum is 61.

The square root of 199597489 is about 14127.8975435130. The cubic root of 199597489 is about 584.4109677272.

The spelling of 199597489 in words is "one hundred ninety-nine million, five hundred ninety-seven thousand, four hundred eighty-nine".