126400025 has 12 divisors (see below), whose sum is σ = 158499900. Its totient is φ = 99982080.

The previous prime is 126400013. The next prime is 126400031. The reversal of 126400025 is 520004621.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 49942489 + 76457536 = 7067^2 + 8744^2 .

It is a de Polignac number, because none of the positive numbers 2^k-126400025 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26180 + ... + 30629.

It is an arithmetic number, because the mean of its divisors is an integer number (13208325).

Almost surely, 2^126400025 is an apocalyptic number.

It is an amenable number.

126400025 is a deficient number, since it is larger than the sum of its proper divisors (32099875).

126400025 is an equidigital number, since it uses as much as digits as its factorization.

126400025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 56908 (or 56903 counting only the distinct ones).

The product of its (nonzero) digits is 480, while the sum is 20.

The square root of 126400025 is about 11242.7765698692. The cubic root of 126400025 is about 501.8597739054.

Adding to 126400025 its reverse (520004621), we get a palindrome (646404646).

The spelling of 126400025 in words is "one hundred twenty-six million, four hundred thousand, twenty-five".