1227721 has 4 divisors (see below), whose sum is σ = 1339344. Its totient is φ = 1116100.

The previous prime is 1227719. The next prime is 1227769. The reversal of 1227721 is 1277221.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1227721 - 2¹ = 1227719 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 1227692 and 1227701.

It is not an unprimeable number, because it can be changed into a prime (1227701) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 55795 + ... + 55816.

It is an arithmetic number, because the mean of its divisors is an integer number (334836).

2^1227721 is an apocalyptic number.

1227721 is a gapful number since it is divisible by the number (11) formed by its first and last digit.

It is an amenable number.

1227721 is a deficient number, since it is larger than the sum of its proper divisors (111623).

1227721 is a wasteful number, since it uses less digits than its factorization.

1227721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111622.

The product of its digits is 392, while the sum is 22.

The square root of 1227721 is about 1108.0257217231. The cubic root of 1227721 is about 107.0779122181.

It can be divided in two parts, 1 and 227721, that added together give a palindrome (227722).

The spelling of 1227721 in words is "one million, two hundred twenty-seven thousand, seven hundred twenty-one".