1980492647 has 4 divisors (see below), whose sum is σ = 2263420176. Its totient is φ = 1697565120.

The previous prime is 1980492643. The next prime is 1980492649. The reversal of 1980492647 is 7462940891.

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

It is a cyclic number.

It is not a de Polignac number, because 1980492647 - 2² = 1980492643 is a prime.

It is a super-2 number, since 2×1980492647² = 7844702249642133218, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1980492595 and 1980492604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1980492641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 141463754 + ... + 141463767.

It is an arithmetic number, because the mean of its divisors is an integer number (565855044).

Almost surely, 2^1980492647 is an apocalyptic number.

1980492647 is a deficient number, since it is larger than the sum of its proper divisors (282927529).

1980492647 is an equidigital number, since it uses as much as digits as its factorization.

1980492647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 282927528.

The product of its (nonzero) digits is 870912, while the sum is 50.

The square root of 1980492647 is about 44502.7262872737. The cubic root of 1980492647 is about 1255.8113718565.

The spelling of 1980492647 in words is "one billion, nine hundred eighty million, four hundred ninety-two thousand, six hundred forty-seven".