126503999 has 4 divisors (see below), whose sum is σ = 129923064. Its totient is φ = 123084936.

The previous prime is 126503947. The next prime is 126504011. The reversal of 126503999 is 999305621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 999305621 = 971 ⋅1029151.

It is a cyclic number.

It is not a de Polignac number, because 126503999 - 2¹² = 126499903 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126503599) 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, 1709477 + ... + 1709550.

It is an arithmetic number, because the mean of its divisors is an integer number (32480766).

Almost surely, 2^126503999 is an apocalyptic number.

126503999 is a deficient number, since it is larger than the sum of its proper divisors (3419065).

126503999 is an equidigital number, since it uses as much as digits as its factorization.

126503999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3419064.

The product of its (nonzero) digits is 131220, while the sum is 44.

The square root of 126503999 is about 11247.3996550314. The cubic root of 126503999 is about 501.9973426207.

The spelling of 126503999 in words is "one hundred twenty-six million, five hundred three thousand, nine hundred ninety-nine".