126720189 has 12 divisors (see below), whose sum is σ = 185548636. Its totient is φ = 83322432.

The previous prime is 126720173. The next prime is 126720199. The reversal of 126720189 is 981027621.

It can be written as a sum of positive squares in 2 ways, for example, as 89302500 + 37417689 = 9450^2 + 6117^2 .

It is not a de Polignac number, because 126720189 - 2⁴ = 126720173 is a prime.

It is a super-3 number, since 3×126720189³ (a number of 25 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126720109) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 95782 + ... + 97095.

Almost surely, 2^126720189 is an apocalyptic number.

It is an amenable number.

126720189 is a deficient number, since it is larger than the sum of its proper divisors (58828447).

126720189 is a wasteful number, since it uses less digits than its factorization.

126720189 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 192956 (or 192953 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 126720189 is about 11257.0062183513. The cubic root of 126720189 is about 502.2831439719.

The spelling of 126720189 in words is "one hundred twenty-six million, seven hundred twenty thousand, one hundred eighty-nine".