1389966773 has 8 divisors (see below), whose sum is σ = 1497617688. Its totient is φ = 1282420224.

The previous prime is 1389966763. The next prime is 1389966829. The reversal of 1389966773 is 3776699831.

It can be written as a sum of positive squares in 4 ways, for example, as 199854769 + 1190112004 = 14137^2 + 34498^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1389966773 - 2⁴ = 1389966757 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389966703) 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 7 ways as a sum of consecutive naturals, for example, 2765 + ... + 52797.

It is an arithmetic number, because the mean of its divisors is an integer number (187202211).

Almost surely, 2^1389966773 is an apocalyptic number.

1389966773 is a gapful number since it is divisible by the number (13) formed by its first and last digit.

It is an amenable number.

1389966773 is a deficient number, since it is larger than the sum of its proper divisors (107650915).

1389966773 is a wasteful number, since it uses less digits than its factorization.

1389966773 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52183.

The product of its digits is 10287648, while the sum is 59.

The square root of 1389966773 is about 37282.2581531752. The cubic root of 1389966773 is about 1116.0101372927.

The spelling of 1389966773 in words is "one billion, three hundred eighty-nine million, nine hundred sixty-six thousand, seven hundred seventy-three".