126243 has 18 divisors (see below), whose sum is σ = 199836. Its totient is φ = 76752.

The previous prime is 126241. The next prime is 126257. The reversal of 126243 is 342621.

It is a happy number.

It is not a de Polignac number, because 126243 - 2¹ = 126241 is a prime.

It is a hoax number, since the sum of its digits (18) coincides with the sum of the digits of its distinct prime factors.

126243 is a modest number, since divided by 243 gives 126 as remainder.

126243 is a lucky number.

It is not an unprimeable number, because it can be changed into a prime (126241) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 1480 + ... + 1562.

It is an arithmetic number, because the mean of its divisors is an integer number (11102).

2¹²⁶²⁴³ is an apocalyptic number.

126243 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

126243 is a deficient number, since it is larger than the sum of its proper divisors (73593).

126243 is a wasteful number, since it uses less digits than its factorization.

126243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115 (or 99 counting only the distinct ones).

The product of its digits is 288, while the sum is 18.

The square root of 126243 is about 355.3069095866. The cubic root of 126243 is about 50.1651869975.

Adding to 126243 its reverse (342621), we get a palindrome (468864).

It can be divided in two parts, 1 and 26243, that added together give a square (26244 = 162²).

The spelling of 126243 in words is "one hundred twenty-six thousand, two hundred forty-three".