1320870365 has 4 divisors (see below), whose sum is σ = 1585044444. Its totient is φ = 1056696288.

The previous prime is 1320870349. The next prime is 1320870373. The reversal of 1320870365 is 5630780231.

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

It can be written as a sum of positive squares in 2 ways, for example, as 929701081 + 391169284 = 30491^2 + 19778^2 .

It is a cyclic number.

It is not a de Polignac number, because 1320870365 - 2⁴ = 1320870349 is a prime.

It is a super-2 number, since 2×1320870365² = 3489397042270466450, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 132087032 + ... + 132087041.

It is an arithmetic number, because the mean of its divisors is an integer number (396261111).

Almost surely, 2^1320870365 is an apocalyptic number.

It is an amenable number.

1320870365 is a deficient number, since it is larger than the sum of its proper divisors (264174079).

1320870365 is an equidigital number, since it uses as much as digits as its factorization.

1320870365 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 264174078.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 1320870365 is about 36343.7802794371. The cubic root of 1320870365 is about 1097.2023576993.

The spelling of 1320870365 in words is "one billion, three hundred twenty million, eight hundred seventy thousand, three hundred sixty-five".