1389778671 has 8 divisors (see below), whose sum is σ = 1861202304. Its totient is φ = 922437080.

The previous prime is 1389778669. The next prime is 1389778697. The reversal of 1389778671 is 1768779831.

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 1389778671 - 2¹ = 1389778669 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389778651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1019715 + ... + 1021076.

It is an arithmetic number, because the mean of its divisors is an integer number (232650288).

Almost surely, 2^1389778671 is an apocalyptic number.

1389778671 is a deficient number, since it is larger than the sum of its proper divisors (471423633).

1389778671 is a wasteful number, since it uses less digits than its factorization.

1389778671 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2041021.

The product of its digits is 3556224, while the sum is 57.

The square root of 1389778671 is about 37279.7353933742. The cubic root of 1389778671 is about 1115.9597923940.

The spelling of 1389778671 in words is "one billion, three hundred eighty-nine million, seven hundred seventy-eight thousand, six hundred seventy-one".