1984656169 has 12 divisors (see below), whose sum is σ = 2032681284. Its totient is φ = 1937740064.

The previous prime is 1984656071. The next prime is 1984656187. The reversal of 1984656169 is 9616564891.

It can be written as a sum of positive squares in 2 ways, for example, as 644144400 + 1340511769 = 25380^2 + 36613^2 .

It is not a de Polignac number, because 1984656169 - 2⁹ = 1984655657 is a prime.

It is a super-2 number, since 2×1984656169² = 7877720218299513122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1984650169) 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 11 ways as a sum of consecutive naturals, for example, 1229607 + ... + 1231219.

It is an arithmetic number, because the mean of its divisors is an integer number (169390107).

Almost surely, 2^1984656169 is an apocalyptic number.

It is an amenable number.

1984656169 is a deficient number, since it is larger than the sum of its proper divisors (48025115).

1984656169 is an equidigital number, since it uses as much as digits as its factorization.

1984656169 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2264 (or 2217 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 55.

The square root of 1984656169 is about 44549.4800081886. The cubic root of 1984656169 is about 1256.6907723410.

The spelling of 1984656169 in words is "one billion, nine hundred eighty-four million, six hundred fifty-six thousand, one hundred sixty-nine".