1992307745 has 4 divisors (see below), whose sum is σ = 2390769300. Its totient is φ = 1593846192.

The previous prime is 1992307729. The next prime is 1992307753. The reversal of 1992307745 is 5477032991.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5477032991 = 137 ⋅39978343.

It can be written as a sum of positive squares in 2 ways, for example, as 1344248896 + 648058849 = 36664^2 + 25457^2 .

It is a cyclic number.

It is not a de Polignac number, because 1992307745 - 2⁴ = 1992307729 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1992307745.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 199230770 + ... + 199230779.

It is an arithmetic number, because the mean of its divisors is an integer number (597692325).

Almost surely, 2^1992307745 is an apocalyptic number.

It is an amenable number.

1992307745 is a deficient number, since it is larger than the sum of its proper divisors (398461555).

1992307745 is an equidigital number, since it uses as much as digits as its factorization.

1992307745 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 398461554.

The product of its (nonzero) digits is 476280, while the sum is 47.

The square root of 1992307745 is about 44635.2746714972. The cubic root of 1992307745 is about 1258.3037022782.

The spelling of 1992307745 in words is "one billion, nine hundred ninety-two million, three hundred seven thousand, seven hundred forty-five".