1389005747 has 8 divisors (see below), whose sum is σ = 1451089920. Its totient is φ = 1328001480.

The previous prime is 1389005713. The next prime is 1389005777. The reversal of 1389005747 is 7475009831.

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 1389005747 - 2¹² = 1389001651 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1389005698 and 1389005707.

It is not an unprimeable number, because it can be changed into a prime (1389005777) 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, 267347 + ... + 272492.

It is an arithmetic number, because the mean of its divisors is an integer number (181386240).

Almost surely, 2^1389005747 is an apocalyptic number.

1389005747 is a deficient number, since it is larger than the sum of its proper divisors (62084173).

1389005747 is an equidigital number, since it uses as much as digits as its factorization.

1389005747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 539953.

The product of its (nonzero) digits is 211680, while the sum is 44.

The square root of 1389005747 is about 37269.3674081007. The cubic root of 1389005747 is about 1115.7528740607.

The spelling of 1389005747 in words is "one billion, three hundred eighty-nine million, five thousand, seven hundred forty-seven".