125409 has 8 divisors (see below), whose sum is σ = 177120. Its totient is φ = 78656.

The previous prime is 125407. The next prime is 125423. The reversal of 125409 is 904521.

125409 is nontrivially palindromic in base 16.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 125409 - 2¹ = 125407 is a prime.

It is a plaindrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (125407) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1179 + ... + 1280.

It is an arithmetic number, because the mean of its divisors is an integer number (22140).

2¹²⁵⁴⁰⁹ is an apocalyptic number.

It is an amenable number.

125409 is a deficient number, since it is larger than the sum of its proper divisors (51711).

125409 is a wasteful number, since it uses less digits than its factorization.

125409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2479.

The product of its (nonzero) digits is 360, while the sum is 21.

The square root of 125409 is about 354.1313315706. The cubic root of 125409 is about 50.0544739635.

The spelling of 125409 in words is "one hundred twenty-five thousand, four hundred nine".