1643760434 has 4 divisors (see below), whose sum is σ = 2465640654. Its totient is φ = 821880216.

The previous prime is 1643760421. The next prime is 1643760451. The reversal of 1643760434 is 4340673461.

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: 4340673461 = 17 ⋅255333733.

It can be written as a sum of positive squares in only one way, i.e., 1559065225 + 84695209 = 39485^2 + 9203^2 .

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 as a sum of consecutive naturals, namely, 410940107 + ... + 410940110.

Almost surely, 2^1643760434 is an apocalyptic number.

1643760434 is a deficient number, since it is larger than the sum of its proper divisors (821880220).

1643760434 is an equidigital number, since it uses as much as digits as its factorization.

1643760434 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 821880219.

The product of its (nonzero) digits is 145152, while the sum is 38.

The square root of 1643760434 is about 40543.3155279634. The cubic root of 1643760434 is about 1180.1743575545.

The spelling of 1643760434 in words is "one billion, six hundred forty-three million, seven hundred sixty thousand, four hundred thirty-four".