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1984921 is a prime number
BaseRepresentation
bin111100100100110011001
310201211210121
413210212121
51002004141
6110313241
722604641
oct7444631
93654717
101984921
111136334
127b8821
13546613
14399521
152931d1
hex1e4999

1984921 has 2 divisors, whose sum is σ = 1984922. Its totient is φ = 1984920.

The previous prime is 1984907. The next prime is 1984979. The reversal of 1984921 is 1294891.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1466521 + 518400 = 1211^2 + 720^2 .

It is a cyclic number.

It is not a de Polignac number, because 1984921 - 27 = 1984793 is a prime.

It is a super-2 number, since 2×19849212 = 7879822752482, which contains 22 as substring.

1984921 is a lucky number.

It is not a weakly prime, because it can be changed into another prime (1984901) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 992460 + 992461.

It is an arithmetic number, because the mean of its divisors is an integer number (992461).

21984921 is an apocalyptic number.

It is an amenable number.

1984921 is a deficient number, since it is larger than the sum of its proper divisors (1).

1984921 is an equidigital number, since it uses as much as digits as its factorization.

1984921 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5184, while the sum is 34.

The square root of 1984921 is about 1408.8722440307. The cubic root of 1984921 is about 125.6746667140.

The spelling of 1984921 in words is "one million, nine hundred eighty-four thousand, nine hundred twenty-one".