1389390361 has 4 divisors (see below), whose sum is σ = 1389500800. Its totient is φ = 1389279924.

The previous prime is 1389390347. The next prime is 1389390383. The reversal of 1389390361 is 1630939831.

It is a happy number.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 1630939831 = 613 ⋅2660587.

It is a cyclic number.

It is not a de Polignac number, because 1389390361 - 2²¹ = 1387293209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1389390341) 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, 33501 + ... + 62458.

It is an arithmetic number, because the mean of its divisors is an integer number (347375200).

Almost surely, 2^1389390361 is an apocalyptic number.

It is an amenable number.

1389390361 is a deficient number, since it is larger than the sum of its proper divisors (110439).

1389390361 is an equidigital number, since it uses as much as digits as its factorization.

1389390361 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110438.

The product of its (nonzero) digits is 104976, while the sum is 43.

The square root of 1389390361 is about 37274.5269721830. The cubic root of 1389390361 is about 1115.8558480943.

The spelling of 1389390361 in words is "one billion, three hundred eighty-nine million, three hundred ninety thousand, three hundred sixty-one".