1389757678 has 8 divisors (see below), whose sum is σ = 2133116568. Its totient is φ = 678718824.

The previous prime is 1389757661. The next prime is 1389757741. The reversal of 1389757678 is 8767579831.

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 8079901 + ... + 8080072.

It is an arithmetic number, because the mean of its divisors is an integer number (266639571).

Almost surely, 2^1389757678 is an apocalyptic number.

1389757678 is a deficient number, since it is larger than the sum of its proper divisors (743358890).

1389757678 is a wasteful number, since it uses less digits than its factorization.

1389757678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16160018.

The product of its digits is 17781120, while the sum is 61.

The square root of 1389757678 is about 37279.4538318361. The cubic root of 1389757678 is about 1115.9541734029.

The spelling of 1389757678 in words is "one billion, three hundred eighty-nine million, seven hundred fifty-seven thousand, six hundred seventy-eight".