126719865 has 12 divisors (see below), whose sum is σ = 219647844. Its totient is φ = 67583904.

The previous prime is 126719861. The next prime is 126719867. The reversal of 126719865 is 568917621.

It can be written as a sum of positive squares in 2 ways, for example, as 70963776 + 55756089 = 8424^2 + 7467^2 .

It is not a de Polignac number, because 126719865 - 2² = 126719861 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 2815997 = 126719865 / (1 + 2 + 6 + 7 + 1 + 9 + 8 + 6 + 5).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 126719865.

It is not an unprimeable number, because it can be changed into a prime (126719861) 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 11 ways as a sum of consecutive naturals, for example, 1407954 + ... + 1408043.

It is an arithmetic number, because the mean of its divisors is an integer number (18303987).

Almost surely, 2^126719865 is an apocalyptic number.

126719865 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

126719865 is a deficient number, since it is larger than the sum of its proper divisors (92927979).

126719865 is a wasteful number, since it uses less digits than its factorization.

126719865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2816008 (or 2816005 counting only the distinct ones).

The product of its digits is 181440, while the sum is 45.

The square root of 126719865 is about 11256.9918273045. The cubic root of 126719865 is about 502.2827158900.

The spelling of 126719865 in words is "one hundred twenty-six million, seven hundred nineteen thousand, eight hundred sixty-five".