1389406739 has 16 divisors (see below), whose sum is σ = 1612938240. Its totient is φ = 1172193120.

The previous prime is 1389406643. The next prime is 1389406741. The reversal of 1389406739 is 9376049831.

It is not a de Polignac number, because 1389406739 - 2¹² = 1389402643 is a prime.

It is a super-2 number, since 2×1389406739² = 3860902172757228242, which contains 22 as substring.

It is a Smith number, since the sum of its digits (50) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is not an unprimeable number, because it can be changed into a prime (1389400739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 350402 + ... + 354344.

It is an arithmetic number, because the mean of its divisors is an integer number (100808640).

Almost surely, 2^1389406739 is an apocalyptic number.

1389406739 is a deficient number, since it is larger than the sum of its proper divisors (223531501).

1389406739 is an equidigital number, since it uses as much as digits as its factorization.

1389406739 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4730.

The product of its (nonzero) digits is 979776, while the sum is 50.

The square root of 1389406739 is about 37274.7466658058. The cubic root of 1389406739 is about 1115.8602326109.

The spelling of 1389406739 in words is "one billion, three hundred eighty-nine million, four hundred six thousand, seven hundred thirty-nine".