1984669345 has 4 divisors (see below), whose sum is σ = 2381603220. Its totient is φ = 1587735472.

The previous prime is 1984669327. The next prime is 1984669391. The reversal of 1984669345 is 5439664891.

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: 5439664891 = 31 ⋅175473061.

It can be written as a sum of positive squares in 2 ways, for example, as 311204881 + 1673464464 = 17641^2 + 40908^2 .

It is a cyclic number.

It is not a de Polignac number, because 1984669345 - 2¹¹ = 1984667297 is a prime.

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, 198466930 + ... + 198466939.

It is an arithmetic number, because the mean of its divisors is an integer number (595400805).

Almost surely, 2^1984669345 is an apocalyptic number.

It is an amenable number.

1984669345 is a deficient number, since it is larger than the sum of its proper divisors (396933875).

1984669345 is an equidigital number, since it uses as much as digits as its factorization.

1984669345 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 396933874.

The product of its digits is 5598720, while the sum is 55.

The square root of 1984669345 is about 44549.6278884572. The cubic root of 1984669345 is about 1256.6935533636.

The spelling of 1984669345 in words is "one billion, nine hundred eighty-four million, six hundred sixty-nine thousand, three hundred forty-five".