1487821 has 2 divisors, whose sum is σ = 1487822. Its totient is φ = 1487820.

The previous prime is 1487819. The next prime is 1487867. The reversal of 1487821 is 1287841.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1406596 + 81225 = 1186^2 + 285^2 .

It is an emirp because it is prime and its reverse (1287841) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1487821 - 2¹ = 1487819 is a prime.

It is a super-2 number, since 2×1487821² = 4427222656082, which contains 22 as substring.

Together with 1487819, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1482821) 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, 743910 + 743911.

It is an arithmetic number, because the mean of its divisors is an integer number (743911).

2^1487821 is an apocalyptic number.

It is an amenable number.

1487821 is a deficient number, since it is larger than the sum of its proper divisors (1).

1487821 is an equidigital number, since it uses as much as digits as its factorization.

1487821 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3584, while the sum is 31.

The square root of 1487821 is about 1219.7626818361. The cubic root of 1487821 is about 114.1607714173.

The spelling of 1487821 in words is "one million, four hundred eighty-seven thousand, eight hundred twenty-one".