197000138 has 4 divisors (see below), whose sum is σ = 295500210. Its totient is φ = 98500068.

The previous prime is 197000137. The next prime is 197000143. The reversal of 197000138 is 831000791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 831000791 = 233 ⋅3566527.

It can be written as a sum of positive squares in only one way, i.e., 189255049 + 7745089 = 13757^2 + 2783^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 197000138.

It is not an unprimeable number, because it can be changed into a prime (197000137) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 49250033 + ... + 49250036.

Almost surely, 2^197000138 is an apocalyptic number.

197000138 is a deficient number, since it is larger than the sum of its proper divisors (98500072).

197000138 is an equidigital number, since it uses as much as digits as its factorization.

197000138 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98500071.

The product of its (nonzero) digits is 1512, while the sum is 29.

The square root of 197000138 is about 14035.6737636638. The cubic root of 197000138 is about 581.8649226166.

The spelling of 197000138 in words is "one hundred ninety-seven million, one hundred thirty-eight", and thus it is an aban number.