125989 has 6 divisors (see below), whose sum is σ = 133350. Its totient is φ = 119016.

The previous prime is 125963. The next prime is 126001. The reversal of 125989 is 989521.

It can be written as a sum of positive squares in only one way, i.e., 116964 + 9025 = 342^2 + 95^2 .

It is not a de Polignac number, because 125989 - 2¹¹ = 123941 is a prime.

It is a Duffinian number.

125989 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125929) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 187 + ... + 535.

It is an arithmetic number, because the mean of its divisors is an integer number (22225).

2¹²⁵⁹⁸⁹ is an apocalyptic number.

125989 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

125989 is a deficient number, since it is larger than the sum of its proper divisors (7361).

125989 is an equidigital number, since it uses as much as digits as its factorization.

125989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387 (or 368 counting only the distinct ones).

The product of its digits is 6480, while the sum is 34.

The square root of 125989 is about 354.9492921531. The cubic root of 125989 is about 50.1315204110.

The spelling of 125989 in words is "one hundred twenty-five thousand, nine hundred eighty-nine".