1371920765 has 4 divisors (see below), whose sum is σ = 1646304924. Its totient is φ = 1097536608.

The previous prime is 1371920749. The next prime is 1371920789. The reversal of 1371920765 is 5670291731.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5670291731 = 13 ⋅436176287.

It can be written as a sum of positive squares in 2 ways, for example, as 667602244 + 704318521 = 25838^2 + 26539^2 .

It is a cyclic number.

It is not a de Polignac number, because 1371920765 - 2⁴ = 1371920749 is a prime.

It is a Duffinian number.

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, 137192072 + ... + 137192081.

It is an arithmetic number, because the mean of its divisors is an integer number (411576231).

Almost surely, 2^1371920765 is an apocalyptic number.

It is an amenable number.

1371920765 is a deficient number, since it is larger than the sum of its proper divisors (274384159).

1371920765 is an equidigital number, since it uses as much as digits as its factorization.

1371920765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274384158.

The product of its (nonzero) digits is 79380, while the sum is 41.

The square root of 1371920765 is about 37039.4487674965. The cubic root of 1371920765 is about 1111.1593451968.

The spelling of 1371920765 in words is "one billion, three hundred seventy-one million, nine hundred twenty thousand, seven hundred sixty-five".