1982472643 has 4 divisors (see below), whose sum is σ = 2024652960. Its totient is φ = 1940292328.

The previous prime is 1982472641. The next prime is 1982472719. The reversal of 1982472643 is 3462742891.

It is a happy number.

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 1982472643 - 2¹ = 1982472641 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1982472593 and 1982472602.

It is not an unprimeable number, because it can be changed into a prime (1982472641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21090088 + ... + 21090181.

It is an arithmetic number, because the mean of its divisors is an integer number (506163240).

Almost surely, 2^1982472643 is an apocalyptic number.

1982472643 is a deficient number, since it is larger than the sum of its proper divisors (42180317).

1982472643 is an equidigital number, since it uses as much as digits as its factorization.

1982472643 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42180316.

The product of its digits is 580608, while the sum is 46.

The square root of 1982472643 is about 44524.9665131822. The cubic root of 1982472643 is about 1256.2297312869.

The spelling of 1982472643 in words is "one billion, nine hundred eighty-two million, four hundred seventy-two thousand, six hundred forty-three".