1920765493 has 2 divisors, whose sum is σ = 1920765494. Its totient is φ = 1920765492.

The previous prime is 1920765481. The next prime is 1920765541. The reversal of 1920765493 is 3945670291.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1290102724 + 630662769 = 35918^2 + 25113^2 .

It is a cyclic number.

It is not a de Polignac number, because 1920765493 - 2¹⁷ = 1920634421 is a prime.

It is a super-4 number, since 4×1920765493⁴ (a number of 38 digits) contains 4444 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1920765463) by changing a digit.

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 as a sum of consecutive naturals, namely, 960382746 + 960382747.

It is an arithmetic number, because the mean of its divisors is an integer number (960382747).

Almost surely, 2^1920765493 is an apocalyptic number.

It is an amenable number.

1920765493 is a deficient number, since it is larger than the sum of its proper divisors (1).

1920765493 is an equidigital number, since it uses as much as digits as its factorization.

1920765493 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 408240, while the sum is 46.

The square root of 1920765493 is about 43826.5386837701. The cubic root of 1920765493 is about 1243.0581585410.

The spelling of 1920765493 in words is "one billion, nine hundred twenty million, seven hundred sixty-five thousand, four hundred ninety-three".