1923780097 has 4 divisors (see below), whose sum is σ = 1926781956. Its totient is φ = 1920778240.

The previous prime is 1923780091. The next prime is 1923780101. The reversal of 1923780097 is 7900873291.

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: 7900873291 = 457 ⋅17288563.

It can be written as a sum of positive squares in 2 ways, for example, as 1477556721 + 446223376 = 38439^2 + 21124^2 .

It is a cyclic number.

It is not a de Polignac number, because 1923780097 - 2¹¹ = 1923778049 is a prime.

It is a super-2 number, since 2×1923780097² = 7401859723226658818, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1923780091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1499968 + ... + 1501249.

It is an arithmetic number, because the mean of its divisors is an integer number (481695489).

Almost surely, 2^1923780097 is an apocalyptic number.

It is an amenable number.

1923780097 is a deficient number, since it is larger than the sum of its proper divisors (3001859).

1923780097 is an equidigital number, since it uses as much as digits as its factorization.

1923780097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3001858.

The product of its (nonzero) digits is 190512, while the sum is 46.

The square root of 1923780097 is about 43860.9176488591. The cubic root of 1923780097 is about 1243.7081371329.

The spelling of 1923780097 in words is "one billion, nine hundred twenty-three million, seven hundred eighty thousand, ninety-seven".