1943449645 has 8 divisors (see below), whose sum is σ = 2412558360. Its totient is φ = 1501147200.

The previous prime is 1943449643. The next prime is 1943449687. The reversal of 1943449645 is 5469443491.

It can be written as a sum of positive squares in 4 ways, for example, as 63186601 + 1880263044 = 7949^2 + 43362^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 1943449645 - 2¹ = 1943449643 is a prime.

It is a super-3 number, since 3×1943449645³ (a number of 29 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1943449643) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 6701406 + ... + 6701695.

It is an arithmetic number, because the mean of its divisors is an integer number (301569795).

Almost surely, 2^1943449645 is an apocalyptic number.

It is an amenable number.

1943449645 is a deficient number, since it is larger than the sum of its proper divisors (469108715).

1943449645 is a wasteful number, since it uses less digits than its factorization.

1943449645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13403135.

The product of its digits is 1866240, while the sum is 49.

The square root of 1943449645 is about 44084.5737758686. The cubic root of 1943449645 is about 1247.9325065286.

The spelling of 1943449645 in words is "one billion, nine hundred forty-three million, four hundred forty-nine thousand, six hundred forty-five".