126401903 has 4 divisors (see below), whose sum is σ = 126444960. Its totient is φ = 126358848.

The previous prime is 126401881. The next prime is 126401917. The reversal of 126401903 is 309104621.

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 126401903 - 2⁶ = 126401839 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 (126401963) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 16775 + ... + 23112.

It is an arithmetic number, because the mean of its divisors is an integer number (31611240).

Almost surely, 2^126401903 is an apocalyptic number.

126401903 is a deficient number, since it is larger than the sum of its proper divisors (43057).

126401903 is an equidigital number, since it uses as much as digits as its factorization.

126401903 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43056.

The product of its (nonzero) digits is 1296, while the sum is 26.

The square root of 126401903 is about 11242.8600898526. The cubic root of 126401903 is about 501.8622593690.

The spelling of 126401903 in words is "one hundred twenty-six million, four hundred one thousand, nine hundred three".