197985767 has 4 divisors (see below), whose sum is σ = 226269456. Its totient is φ = 169702080.

The previous prime is 197985727. The next prime is 197985811. The reversal of 197985767 is 767589791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 767589791 = 31 ⋅24760961.

It is a cyclic number.

It is not a de Polignac number, because 197985767 - 2⁶ = 197985703 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (197985707) 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, 14141834 + ... + 14141847.

It is an arithmetic number, because the mean of its divisors is an integer number (56567364).

Almost surely, 2^197985767 is an apocalyptic number.

197985767 is a deficient number, since it is larger than the sum of its proper divisors (28283689).

197985767 is an equidigital number, since it uses as much as digits as its factorization.

197985767 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28283688.

The product of its digits is 6667920, while the sum is 59.

The square root of 197985767 is about 14070.7415227485. The cubic root of 197985767 is about 582.8337022146.

The spelling of 197985767 in words is "one hundred ninety-seven million, nine hundred eighty-five thousand, seven hundred sixty-seven".