1920342817 has 4 divisors (see below), whose sum is σ = 1920431920. Its totient is φ = 1920253716.

The previous prime is 1920342737. The next prime is 1920342821. The reversal of 1920342817 is 7182430291.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 7182430291 = 3673 ⋅1955467.

It is a cyclic number.

It is not a de Polignac number, because 1920342817 - 2¹⁹ = 1919818529 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1920342847) 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, 10234 + ... + 62812.

It is an arithmetic number, because the mean of its divisors is an integer number (480107980).

Almost surely, 2^1920342817 is an apocalyptic number.

It is an amenable number.

1920342817 is a deficient number, since it is larger than the sum of its proper divisors (89103).

1920342817 is an equidigital number, since it uses as much as digits as its factorization.

1920342817 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89102.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 1920342817 is about 43821.7162717299. The cubic root of 1920342817 is about 1242.9669710436.

The spelling of 1920342817 in words is "one billion, nine hundred twenty million, three hundred forty-two thousand, eight hundred seventeen".