126728443 has 4 divisors (see below), whose sum is σ = 126798048. Its totient is φ = 126658840.

The previous prime is 126728429. The next prime is 126728449. The reversal of 126728443 is 344827621.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 344827621 = 43 ⋅8019247.

It is a cyclic number.

It is not a de Polignac number, because 126728443 - 2²¹ = 124631291 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (126728449) 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, 31996 + ... + 35737.

It is an arithmetic number, because the mean of its divisors is an integer number (31699512).

Almost surely, 2^126728443 is an apocalyptic number.

126728443 is a deficient number, since it is larger than the sum of its proper divisors (69605).

126728443 is an equidigital number, since it uses as much as digits as its factorization.

126728443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69604.

The product of its digits is 64512, while the sum is 37.

The square root of 126728443 is about 11257.3728285067. The cubic root of 126728443 is about 502.2940492457.

It can be divided in two parts, 12672 and 8443, that added together give a triangular number (21115 = T₂₀₅).

The spelling of 126728443 in words is "one hundred twenty-six million, seven hundred twenty-eight thousand, four hundred forty-three".