1623730345 has 4 divisors (see below), whose sum is σ = 1948476420. Its totient is φ = 1298984272.

The previous prime is 1623730343. The next prime is 1623730349. The reversal of 1623730345 is 5430373261.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 649791081 + 973939264 = 25491^2 + 31208^2 .

It is a cyclic number.

It is not a de Polignac number, because 1623730345 - 2¹ = 1623730343 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1623730345.

It is not an unprimeable number, because it can be changed into a prime (1623730343) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 162373030 + ... + 162373039.

It is an arithmetic number, because the mean of its divisors is an integer number (487119105).

Almost surely, 2^1623730345 is an apocalyptic number.

It is an amenable number.

1623730345 is a deficient number, since it is larger than the sum of its proper divisors (324746075).

1623730345 is an equidigital number, since it uses as much as digits as its factorization.

1623730345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324746074.

The product of its (nonzero) digits is 45360, while the sum is 34.

The square root of 1623730345 is about 40295.5375320891. The cubic root of 1623730345 is about 1175.3610708655.

The spelling of 1623730345 in words is "one billion, six hundred twenty-three million, seven hundred thirty thousand, three hundred forty-five".