1982381 has 2 divisors, whose sum is σ = 1982382. Its totient is φ = 1982380.

The previous prime is 1982371. The next prime is 1982401. The reversal of 1982381 is 1832891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1190281 + 792100 = 1091^2 + 890^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1982381 is a prime.

It is a super-2 number, since 2×1982381² = 7859668858322, which contains 22 as substring.

It is an Ulam number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1982371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991190 + 991191.

It is an arithmetic number, because the mean of its divisors is an integer number (991191).

2^1982381 is an apocalyptic number.

It is an amenable number.

1982381 is a deficient number, since it is larger than the sum of its proper divisors (1).

1982381 is an equidigital number, since it uses as much as digits as its factorization.

1982381 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3456, while the sum is 32.

The square root of 1982381 is about 1407.9705252597. The cubic root of 1982381 is about 125.6210373906.

The spelling of 1982381 in words is "one million, nine hundred eighty-two thousand, three hundred eighty-one".