1389030781 has 8 divisors (see below), whose sum is σ = 1472506560. Its totient is φ = 1305751488.

The previous prime is 1389030757. The next prime is 1389030791. The reversal of 1389030781 is 1870309831.

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 1389030781 - 2¹¹ = 1389028733 is a prime.

It is a super-2 number, since 2×1389030781² = 3858813021130939922, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1389030751) 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, 34431 + ... + 62956.

It is an arithmetic number, because the mean of its divisors is an integer number (184063320).

Almost surely, 2^1389030781 is an apocalyptic number.

It is an amenable number.

1389030781 is a deficient number, since it is larger than the sum of its proper divisors (83475779).

1389030781 is an equidigital number, since it uses as much as digits as its factorization.

1389030781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 98243.

The product of its (nonzero) digits is 36288, while the sum is 40.

The square root of 1389030781 is about 37269.7032588133. The cubic root of 1389030781 is about 1115.7595770783.

The spelling of 1389030781 in words is "one billion, three hundred eighty-nine million, thirty thousand, seven hundred eighty-one".