1923149765 has 4 divisors (see below), whose sum is σ = 2307779724. Its totient is φ = 1538519808.

The previous prime is 1923149747. The next prime is 1923149773. The reversal of 1923149765 is 5679413291.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5679413291 = 19 ⋅298916489.

It can be written as a sum of positive squares in 2 ways, for example, as 1259469121 + 663680644 = 35489^2 + 25762^2 .

It is a cyclic number.

It is not a de Polignac number, because 1923149765 - 2⁸ = 1923149509 is a prime.

It is a Duffinian number.

It is a Curzon 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, 192314972 + ... + 192314981.

It is an arithmetic number, because the mean of its divisors is an integer number (576944931).

Almost surely, 2^1923149765 is an apocalyptic number.

It is an amenable number.

1923149765 is a deficient number, since it is larger than the sum of its proper divisors (384629959).

1923149765 is an equidigital number, since it uses as much as digits as its factorization.

1923149765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 384629958.

The product of its digits is 408240, while the sum is 47.

The square root of 1923149765 is about 43853.7314831931. The cubic root of 1923149765 is about 1243.5722874629.

The spelling of 1923149765 in words is "one billion, nine hundred twenty-three million, one hundred forty-nine thousand, seven hundred sixty-five".