1389287709649 has 144 divisors (see below), whose sum is σ = 1873321623936. Its totient is φ = 1023865920000.

The previous prime is 1389287709643. The next prime is 1389287709653. The reversal of 1389287709649 is 9469077829831.

It is not a de Polignac number, because 1389287709649 - 2⁵ = 1389287709617 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1389287709643) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 617185774 + ... + 617188024.

It is an arithmetic number, because the mean of its divisors is an integer number (13009177944).

Almost surely, 2^{1389287709649} is an apocalyptic number.

1389287709649 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

1389287709649 is a deficient number, since it is larger than the sum of its proper divisors (484033914287).

1389287709649 is a wasteful number, since it uses less digits than its factorization.

1389287709649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2404 (or 2378 counting only the distinct ones).

The product of its (nonzero) digits is 329204736, while the sum is 73.

The spelling of 1389287709649 in words is "one trillion, three hundred eighty-nine billion, two hundred eighty-seven million, seven hundred nine thousand, six hundred forty-nine".