1380249689 has 12 divisors (see below), whose sum is σ = 1729104804. Its totient is φ = 1092065184.

The previous prime is 1380249679. The next prime is 1380249713. The reversal of 1380249689 is 9869420831.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 872198089 + 508051600 = 29533^2 + 22540^2 .

It is a de Polignac number, because none of the positive numbers 2^k-1380249689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1380249649) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1082762 + ... + 1084035.

It is an arithmetic number, because the mean of its divisors is an integer number (144092067).

Almost surely, 2^1380249689 is an apocalyptic number.

It is an amenable number.

1380249689 is a deficient number, since it is larger than the sum of its proper divisors (348855115).

1380249689 is a wasteful number, since it uses less digits than its factorization.

1380249689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2166824 (or 2166817 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 50.

The square root of 1380249689 is about 37151.7117909794. The cubic root of 1380249689 is about 1113.4034242887.

The spelling of 1380249689 in words is "one billion, three hundred eighty million, two hundred forty-nine thousand, six hundred eighty-nine".