126400001 has 16 divisors (see below), whose sum is σ = 156508800. Its totient is φ = 99996624.

The previous prime is 126399979. The next prime is 126400013. The reversal of 126400001 is 100004621.

It is not a de Polignac number, because 126400001 - 2¹⁰ = 126398977 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (126400031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11270 + ... + 19488.

It is an arithmetic number, because the mean of its divisors is an integer number (9781800).

Almost surely, 2^126400001 is an apocalyptic number.

It is an amenable number.

126400001 is a deficient number, since it is larger than the sum of its proper divisors (30108799).

126400001 is an frugal number, since it uses more digits than its factorization.

126400001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8265 (or 8239 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 126400001 is about 11242.7755025172. The cubic root of 126400001 is about 501.8597421421.

Adding to 126400001 its reverse (100004621), we get a palindrome (226404622).

The spelling of 126400001 in words is "one hundred twenty-six million, four hundred thousand, one".