1389694433 has 8 divisors (see below), whose sum is σ = 1428143208. Its totient is φ = 1351292544.

The previous prime is 1389694421. The next prime is 1389694441. The reversal of 1389694433 is 3344969831.

It can be written as a sum of positive squares in 4 ways, for example, as 893830609 + 495863824 = 29897^2 + 22268^2 .

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 1389694433 - 2¹⁴ = 1389678049 is a prime.

It is a super-2 number, since 2×1389694433² = 3862501234222382978, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1389694403) 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, 53285 + ... + 74957.

It is an arithmetic number, because the mean of its divisors is an integer number (178517901).

Almost surely, 2^1389694433 is an apocalyptic number.

It is an amenable number.

1389694433 is a deficient number, since it is larger than the sum of its proper divisors (38448775).

1389694433 is a wasteful number, since it uses less digits than its factorization.

1389694433 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23443.

The product of its digits is 1679616, while the sum is 50.

The square root of 1389694433 is about 37278.6055667322. The cubic root of 1389694433 is about 1115.9372448900.

The spelling of 1389694433 in words is "one billion, three hundred eighty-nine million, six hundred ninety-four thousand, four hundred thirty-three".