1970809765 has 4 divisors (see below), whose sum is σ = 2364971724. Its totient is φ = 1576647808.

The previous prime is 1970809759. The next prime is 1970809783. The reversal of 1970809765 is 5679080791.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5679080791 = 19 ⋅298898989.

It can be written as a sum of positive squares in 2 ways, for example, as 1362052836 + 608756929 = 36906^2 + 24673^2 .

It is a cyclic number.

It is not a de Polignac number, because 1970809765 - 2⁵ = 1970809733 is a prime.

It is a super-2 number, since 2×1970809765² = 7768182259638710450, 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 (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 197080972 + ... + 197080981.

It is an arithmetic number, because the mean of its divisors is an integer number (591242931).

Almost surely, 2^1970809765 is an apocalyptic number.

It is an amenable number.

1970809765 is a deficient number, since it is larger than the sum of its proper divisors (394161959).

1970809765 is an equidigital number, since it uses as much as digits as its factorization.

1970809765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394161958.

The product of its (nonzero) digits is 952560, while the sum is 52.

The square root of 1970809765 is about 44393.8032274776. The cubic root of 1970809765 is about 1253.7614198899.

The spelling of 1970809765 in words is "one billion, nine hundred seventy million, eight hundred nine thousand, seven hundred sixty-five".