1982421243 has 32 divisors (see below), whose sum is σ = 3211084800. Its totient is φ = 1198778400.

The previous prime is 1982421239. The next prime is 1982421251. The reversal of 1982421243 is 3421242891.

1982421243 is a `hidden beast` number, since 198 + 2 + 421 + 2 + 43 = 666.

It is not a de Polignac number, because 1982421243 - 2² = 1982421239 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1982421198 and 1982421207.

It is not an unprimeable number, because it can be changed into a prime (1982421253) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 129678 + ... + 144156.

It is an arithmetic number, because the mean of its divisors is an integer number (100346400).

Almost surely, 2^1982421243 is an apocalyptic number.

1982421243 is a deficient number, since it is larger than the sum of its proper divisors (1228663557).

1982421243 is a wasteful number, since it uses less digits than its factorization.

1982421243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14960 (or 14954 counting only the distinct ones).

The product of its digits is 27648, while the sum is 36.

The square root of 1982421243 is about 44524.3893051887. The cubic root of 1982421243 is about 1256.2188743458.

The spelling of 1982421243 in words is "one billion, nine hundred eighty-two million, four hundred twenty-one thousand, two hundred forty-three".