126399 has 16 divisors (see below), whose sum is σ = 207872. Its totient is φ = 66528.

The previous prime is 126397. The next prime is 126421. The reversal of 126399 is 993621.

126399 is an esthetic number in base 9, because in such base its adjacent digits differ by 1.

It is not a de Polignac number, because 126399 - 2¹ = 126397 is a prime.

Its product of digits (2916) is a multiple of the sum of its prime divisors (486).

126399 is a lucky number.

It is a plaindrome in base 8.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126397) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42 + ... + 504.

It is an arithmetic number, because the mean of its divisors is an integer number (12992).

2¹²⁶³⁹⁹ is an apocalyptic number.

126399 is a deficient number, since it is larger than the sum of its proper divisors (81473).

126399 is a wasteful number, since it uses less digits than its factorization.

126399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 486.

The product of its digits is 2916, while the sum is 30.

The square root of 126399 is about 355.5263703300. The cubic root of 126399 is about 50.1858417345.

It can be divided in two parts, 126 and 399, that added together give a palindrome (525).

The spelling of 126399 in words is "one hundred twenty-six thousand, three hundred ninety-nine".