1339391645 has 4 divisors (see below), whose sum is σ = 1607269980. Its totient is φ = 1071513312.

The previous prime is 1339391623. The next prime is 1339391659. The reversal of 1339391645 is 5461939331.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5461939331 = 191 ⋅28596541.

It can be written as a sum of positive squares in 2 ways, for example, as 217208644 + 1122183001 = 14738^2 + 33499^2 .

It is a cyclic number.

It is not a de Polignac number, because 1339391645 - 2¹⁸ = 1339129501 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1339391596 and 1339391605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133939160 + ... + 133939169.

It is an arithmetic number, because the mean of its divisors is an integer number (401817495).

Almost surely, 2^1339391645 is an apocalyptic number.

It is an amenable number.

1339391645 is a deficient number, since it is larger than the sum of its proper divisors (267878335).

1339391645 is an equidigital number, since it uses as much as digits as its factorization.

1339391645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 267878334.

The product of its digits is 262440, while the sum is 44.

The square root of 1339391645 is about 36597.6999960380. The cubic root of 1339391645 is about 1102.3069065357.

The spelling of 1339391645 in words is "one billion, three hundred thirty-nine million, three hundred ninety-one thousand, six hundred forty-five".