197998749 has 40 divisors (see below), whose sum is σ = 324028320. Its totient is φ = 119742624.

The previous prime is 197998721. The next prime is 197998751. The reversal of 197998749 is 947899791.

It is not a de Polignac number, because 197998749 - 2¹⁵ = 197965981 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197994749) by changing a digit.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 60534 + ... + 63720.

It is an arithmetic number, because the mean of its divisors is an integer number (8100708).

Almost surely, 2^197998749 is an apocalyptic number.

It is an amenable number.

197998749 is a deficient number, since it is larger than the sum of its proper divisors (126029571).

197998749 is a wasteful number, since it uses less digits than its factorization.

197998749 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3271 (or 3262 counting only the distinct ones).

The product of its digits is 10287648, while the sum is 63.

The square root of 197998749 is about 14071.2028270507. The cubic root of 197998749 is about 582.8464408100.

The spelling of 197998749 in words is "one hundred ninety-seven million, nine hundred ninety-eight thousand, seven hundred forty-nine".