1282721 has 6 divisors (see below), whose sum is σ = 1410066. Its totient is φ = 1166000.

The previous prime is 1282717. The next prime is 1282739. The reversal of 1282721 is 1272821.

It can be written as a sum of positive squares in only one way, i.e., 1234321 + 48400 = 1111^2 + 220^2 .

It is not a de Polignac number, because 1282721 - 2² = 1282717 is a prime.

It is a Duffinian number.

It is a plaindrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1282751) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 5180 + ... + 5421.

It is an arithmetic number, because the mean of its divisors is an integer number (235011).

2^1282721 is an apocalyptic number.

1282721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1282721 is a deficient number, since it is larger than the sum of its proper divisors (127345).

1282721 is a wasteful number, since it uses less digits than its factorization.

1282721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10623 (or 10612 counting only the distinct ones).

The product of its digits is 448, while the sum is 23.

The square root of 1282721 is about 1132.5727349711. The cubic root of 1282721 is about 108.6535869855.

The spelling of 1282721 in words is "one million, two hundred eighty-two thousand, seven hundred twenty-one".