125728397 has 2 divisors, whose sum is σ = 125728398. Its totient is φ = 125728396.

The previous prime is 125728387. The next prime is 125728409. The reversal of 125728397 is 793827521.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 70879561 + 54848836 = 8419^2 + 7406^2 .

It is a cyclic number.

It is not a de Polignac number, because 125728397 - 2⁶ = 125728333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (125728307) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 62864198 + 62864199.

It is an arithmetic number, because the mean of its divisors is an integer number (62864199).

Almost surely, 2^125728397 is an apocalyptic number.

It is an amenable number.

125728397 is a deficient number, since it is larger than the sum of its proper divisors (1).

125728397 is an equidigital number, since it uses as much as digits as its factorization.

125728397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 211680, while the sum is 44.

The square root of 125728397 is about 11212.8674744688. The cubic root of 125728397 is about 500.9693156401.

The spelling of 125728397 in words is "one hundred twenty-five million, seven hundred twenty-eight thousand, three hundred ninety-seven".