126389 has 4 divisors (see below), whose sum is σ = 127200. Its totient is φ = 125580.

The previous prime is 126359. The next prime is 126397. The reversal of 126389 is 983621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 983621 = 197 ⋅4993.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-126389 is a prime.

It is a d-powerful number, because it can be written as 1 + 2 + 3¹⁰ + 6⁵ + 8³ + 9⁵ .

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126349) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 89 + ... + 510.

It is an arithmetic number, because the mean of its divisors is an integer number (31800).

2¹²⁶³⁸⁹ is an apocalyptic number.

It is an amenable number.

126389 is a deficient number, since it is larger than the sum of its proper divisors (811).

126389 is an equidigital number, since it uses as much as digits as its factorization.

126389 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 810.

The product of its digits is 2592, while the sum is 29.

The square root of 126389 is about 355.5123063974. The cubic root of 126389 is about 50.1845182229.

It can be divided in two parts, 126 and 389, that added together give a palindrome (515).

The spelling of 126389 in words is "one hundred twenty-six thousand, three hundred eighty-nine".