1321829389 has 4 divisors (see below), whose sum is σ = 1379300256. Its totient is φ = 1264358524.

The previous prime is 1321829371. The next prime is 1321829393. The reversal of 1321829389 is 9839281231.

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 not a de Polignac number, because 1321829389 - 2⁵ = 1321829357 is a prime.

It is a super-2 number, since 2×1321829389² = 3494465867248226642, 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 (1321820389) 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, 28735399 + ... + 28735444.

It is an arithmetic number, because the mean of its divisors is an integer number (344825064).

Almost surely, 2^1321829389 is an apocalyptic number.

It is an amenable number.

1321829389 is a deficient number, since it is larger than the sum of its proper divisors (57470867).

1321829389 is an equidigital number, since it uses as much as digits as its factorization.

1321829389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 57470866.

The product of its digits is 186624, while the sum is 46.

The square root of 1321829389 is about 36356.9716698187. The cubic root of 1321829389 is about 1097.4678363974.

The spelling of 1321829389 in words is "one billion, three hundred twenty-one million, eight hundred twenty-nine thousand, three hundred eighty-nine".