1389402409 has 4 divisors (see below), whose sum is σ = 1389605760. Its totient is φ = 1389199060.

The previous prime is 1389402353. The next prime is 1389402419. The reversal of 1389402409 is 9042049831.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1389402409 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1389402419) 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 3 ways as a sum of consecutive naturals, for example, 91057 + ... + 105214.

It is an arithmetic number, because the mean of its divisors is an integer number (347401440).

Almost surely, 2^1389402409 is an apocalyptic number.

It is an amenable number.

1389402409 is a deficient number, since it is larger than the sum of its proper divisors (203351).

1389402409 is an equidigital number, since it uses as much as digits as its factorization.

1389402409 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 203350.

The product of its (nonzero) digits is 62208, while the sum is 40.

The square root of 1389402409 is about 37274.6885835415. The cubic root of 1389402409 is about 1115.8590734399.

The spelling of 1389402409 in words is "one billion, three hundred eighty-nine million, four hundred two thousand, four hundred nine".