1329725279 has 4 divisors (see below), whose sum is σ = 1399710840. Its totient is φ = 1259739720.

The previous prime is 1329725251. The next prime is 1329725281. The reversal of 1329725279 is 9725279231.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 1329725279 - 2²⁰ = 1328676703 is a prime.

It is a super-3 number, since 3×1329725279³ (a number of 28 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1329725239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 34992752 + ... + 34992789.

It is an arithmetic number, because the mean of its divisors is an integer number (349927710).

Almost surely, 2^1329725279 is an apocalyptic number.

1329725279 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

1329725279 is a deficient number, since it is larger than the sum of its proper divisors (69985561).

1329725279 is an equidigital number, since it uses as much as digits as its factorization.

1329725279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69985560.

The product of its digits is 476280, while the sum is 47.

The square root of 1329725279 is about 36465.3983798340. The cubic root of 1329725279 is about 1099.6487250256.

The spelling of 1329725279 in words is "one billion, three hundred twenty-nine million, seven hundred twenty-five thousand, two hundred seventy-nine".