126400003 has 4 divisors (see below), whose sum is σ = 126479320. Its totient is φ = 126320688.

The previous prime is 126399979. The next prime is 126400013. The reversal of 126400003 is 300004621.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 126400003 - 2⁵ = 126399971 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 126400003.

It is not an unprimeable number, because it can be changed into a prime (126400013) 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, 37218 + ... + 40471.

It is an arithmetic number, because the mean of its divisors is an integer number (31619830).

Almost surely, 2^126400003 is an apocalyptic number.

126400003 is a deficient number, since it is larger than the sum of its proper divisors (79317).

126400003 is an equidigital number, since it uses as much as digits as its factorization.

126400003 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79316.

The product of its (nonzero) digits is 144, while the sum is 16.

The square root of 126400003 is about 11242.7755914632. The cubic root of 126400003 is about 501.8597447890.

Adding to 126400003 its reverse (300004621), we get a palindrome (426404624).

The spelling of 126400003 in words is "one hundred twenty-six million, four hundred thousand, three".