125603986 has 4 divisors (see below), whose sum is σ = 188405982. Its totient is φ = 62801992.

The previous prime is 125603963. The next prime is 125603987. The reversal of 125603986 is 689306521.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 689306521 = 79 ⋅8725399.

It can be written as a sum of positive squares in only one way, i.e., 104673361 + 20930625 = 10231^2 + 4575^2 .

It is a super-2 number, since 2×125603986² = 31552722598176392, which contains 22 as substring.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (125603987) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31400995 + ... + 31400998.

Almost surely, 2^125603986 is an apocalyptic number.

125603986 is a deficient number, since it is larger than the sum of its proper divisors (62801996).

125603986 is an equidigital number, since it uses as much as digits as its factorization.

125603986 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 62801995.

The product of its (nonzero) digits is 77760, while the sum is 40.

The square root of 125603986 is about 11207.3184125374. The cubic root of 125603986 is about 500.8040210739.

The spelling of 125603986 in words is "one hundred twenty-five million, six hundred three thousand, nine hundred eighty-six".