126129999 has 48 divisors (see below), whose sum is σ = 191116800. Its totient is φ = 73738368.

The previous prime is 126129931. The next prime is 126130013. The reversal of 126129999 is 999921621.

It is not a de Polignac number, because 126129999 - 2⁸ = 126129743 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126129499) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1417147 + ... + 1417235.

It is an arithmetic number, because the mean of its divisors is an integer number (3981600).

Almost surely, 2^126129999 is an apocalyptic number.

126129999 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

126129999 is a deficient number, since it is larger than the sum of its proper divisors (64986801).

126129999 is a wasteful number, since it uses less digits than its factorization.

126129999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204 (or 181 counting only the distinct ones).

The product of its digits is 157464, while the sum is 48.

The square root of 126129999 is about 11230.7612831900. The cubic root of 126129999 is about 501.5021479172.

The spelling of 126129999 in words is "one hundred twenty-six million, one hundred twenty-nine thousand, nine hundred ninety-nine".