1982401 has 2 divisors, whose sum is σ = 1982402. Its totient is φ = 1982400.

The previous prime is 1982381. The next prime is 1982417. The reversal of 1982401 is 1042891.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1962801 + 19600 = 1401^2 + 140^2 .

It is a cyclic number.

It is not a de Polignac number, because 1982401 - 2⁷ = 1982273 is a prime.

It is not a weakly prime, because it can be changed into another prime (1982471) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 991200 + 991201.

It is an arithmetic number, because the mean of its divisors is an integer number (991201).

2^1982401 is an apocalyptic number.

It is an amenable number.

1982401 is a deficient number, since it is larger than the sum of its proper divisors (1).

1982401 is an equidigital number, since it uses as much as digits as its factorization.

1982401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 576, while the sum is 25.

The square root of 1982401 is about 1407.9776276632. The cubic root of 1982401 is about 125.6214598476.

The spelling of 1982401 in words is "one million, nine hundred eighty-two thousand, four hundred one".