1394689689 has 6 divisors (see below), whose sum is σ = 2014551786. Its totient is φ = 929793120.

The previous prime is 1394689687. The next prime is 1394689691. The reversal of 1394689689 is 9869864931.

It is a happy number.

1394689689 is a `hidden beast` number, since 1 + 3 + 9 + 468 + 96 + 89 = 666.

It is an interprime number because it is at equal distance from previous prime (1394689687) and next prime (1394689691).

It can be written as a sum of positive squares in only one way, i.e., 1331009289 + 63680400 = 36483^2 + 7980^2 .

It is not a de Polignac number, because 1394689689 - 2¹ = 1394689687 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1394689687) 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 5 ways as a sum of consecutive naturals, for example, 77482752 + ... + 77482769.

It is an arithmetic number, because the mean of its divisors is an integer number (335758631).

Almost surely, 2^1394689689 is an apocalyptic number.

It is an amenable number.

1394689689 is a deficient number, since it is larger than the sum of its proper divisors (619862097).

1394689689 is a wasteful number, since it uses less digits than its factorization.

1394689689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154965527 (or 154965524 counting only the distinct ones).

The product of its digits is 20155392, while the sum is 63.

The square root of 1394689689 is about 37345.5444330378. The cubic root of 1394689689 is about 1117.2727246765.

The spelling of 1394689689 in words is "one billion, three hundred ninety-four million, six hundred eighty-nine thousand, six hundred eighty-nine".