197942039 has 2 divisors, whose sum is σ = 197942040. Its totient is φ = 197942038.

The previous prime is 197942009. The next prime is 197942047. The reversal of 197942039 is 930249791.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-197942039 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (197942009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 98971019 + 98971020.

It is an arithmetic number, because the mean of its divisors is an integer number (98971020).

Almost surely, 2^197942039 is an apocalyptic number.

197942039 is a deficient number, since it is larger than the sum of its proper divisors (1).

197942039 is an equidigital number, since it uses as much as digits as its factorization.

197942039 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 44.

The square root of 197942039 is about 14069.1875742702. The cubic root of 197942039 is about 582.7907899907.

The spelling of 197942039 in words is "one hundred ninety-seven million, nine hundred forty-two thousand, thirty-nine".