126756389 has 4 divisors (see below), whose sum is σ = 129704256. Its totient is φ = 123808524.

The previous prime is 126756359. The next prime is 126756401. The reversal of 126756389 is 983657621.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a de Polignac number, because none of the positive numbers 2^k-126756389 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 (126756319) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 1473869 + ... + 1473954.

It is an arithmetic number, because the mean of its divisors is an integer number (32426064).

Almost surely, 2^126756389 is an apocalyptic number.

It is an amenable number.

126756389 is a deficient number, since it is larger than the sum of its proper divisors (2947867).

126756389 is an equidigital number, since it uses as much as digits as its factorization.

126756389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2947866.

The product of its digits is 544320, while the sum is 47.

The square root of 126756389 is about 11258.6139910737. The cubic root of 126756389 is about 502.3309682869.

The spelling of 126756389 in words is "one hundred twenty-six million, seven hundred fifty-six thousand, three hundred eighty-nine".