1246720689 has 12 divisors (see below), whose sum is σ = 1803745476. Its totient is φ = 829796352.

The previous prime is 1246720667. The next prime is 1246720691. The reversal of 1246720689 is 9860276421.

It is a happy number.

1246720689 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 656230689 + 590490000 = 25617^2 + 24300^2 .

It is not a de Polignac number, because 1246720689 - 2¹⁵ = 1246687921 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1246720639) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 106704 + ... + 117809.

It is an arithmetic number, because the mean of its divisors is an integer number (150312123).

Almost surely, 2^1246720689 is an apocalyptic number.

It is an amenable number.

1246720689 is a deficient number, since it is larger than the sum of its proper divisors (557024787).

1246720689 is a wasteful number, since it uses less digits than its factorization.

1246720689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225136 (or 225133 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 1246720689 is about 35308.9321418816. The cubic root of 1246720689 is about 1076.2745118594.

The spelling of 1246720689 in words is "one billion, two hundred forty-six million, seven hundred twenty thousand, six hundred eighty-nine".