126278109 has 28 divisors (see below), whose sum is σ = 191703456. Its totient is φ = 83131272.

The previous prime is 126278099. The next prime is 126278137. The reversal of 126278109 is 901872621.

126278109 is a `hidden beast` number, since 12 + 627 + 8 + 10 + 9 = 666.

It is not a de Polignac number, because 126278109 - 2¹³ = 126269917 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126278149) 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 27 ways as a sum of consecutive naturals, for example, 59464 + ... + 61550.

It is an arithmetic number, because the mean of its divisors is an integer number (6846552).

Almost surely, 2^126278109 is an apocalyptic number.

It is an amenable number.

126278109 is a deficient number, since it is larger than the sum of its proper divisors (65425347).

126278109 is an frugal number, since it uses more digits than its factorization.

126278109 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2188 (or 2173 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 36.

The square root of 126278109 is about 11237.3532915896. The cubic root of 126278109 is about 501.6983698810.

It can be divided in two parts, 12627 and 8109, that added together give a 4-th power (20736 = 12⁴).

The spelling of 126278109 in words is "one hundred twenty-six million, two hundred seventy-eight thousand, one hundred nine".