126709749 has 24 divisors (see below), whose sum is σ = 187395000. Its totient is φ = 82477440.

The previous prime is 126709717. The next prime is 126709753. The reversal of 126709749 is 947907621.

It can be written as a sum of positive squares in 4 ways, for example, as 5489649 + 121220100 = 2343^2 + 11010^2 .

It is not a de Polignac number, because 126709749 - 2⁵ = 126709717 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (126709769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 81027 + ... + 82575.

It is an arithmetic number, because the mean of its divisors is an integer number (7808125).

Almost surely, 2^126709749 is an apocalyptic number.

It is an amenable number.

126709749 is a deficient number, since it is larger than the sum of its proper divisors (60685251).

126709749 is a wasteful number, since it uses less digits than its factorization.

126709749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1765 (or 1762 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 45.

The square root of 126709749 is about 11256.5424975878. The cubic root of 126709749 is about 502.2693498531.

The spelling of 126709749 in words is "one hundred twenty-six million, seven hundred nine thousand, seven hundred forty-nine".