1389012779 has 8 divisors (see below), whose sum is σ = 1731756288. Its totient is φ = 1082347560.

The previous prime is 1389012749. The next prime is 1389012787. The reversal of 1389012779 is 9772109831.

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

It is a de Polignac number, because none of the positive numbers 2^k-1389012779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1389012749) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9019487 + ... + 9019640.

It is an arithmetic number, because the mean of its divisors is an integer number (216469536).

Almost surely, 2^1389012779 is an apocalyptic number.

1389012779 is a deficient number, since it is larger than the sum of its proper divisors (342743509).

1389012779 is a wasteful number, since it uses less digits than its factorization.

1389012779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18039145.

The product of its (nonzero) digits is 190512, while the sum is 47.

The square root of 1389012779 is about 37269.4617481927. The cubic root of 1389012779 is about 1115.7547569330.

The spelling of 1389012779 in words is "one billion, three hundred eighty-nine million, twelve thousand, seven hundred seventy-nine".