1022721 has 16 divisors (see below), whose sum is σ = 1609728. Its totient is φ = 565200.

The previous prime is 1022719. The next prime is 1022729. The reversal of 1022721 is 1272201.

1022721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 1022721 - 2¹ = 1022719 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 1022721.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1022729) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 135 + ... + 1436.

It is an arithmetic number, because the mean of its divisors is an integer number (100608).

2^1022721 is an apocalyptic number.

It is an amenable number.

1022721 is a deficient number, since it is larger than the sum of its proper divisors (587007).

1022721 is a wasteful number, since it uses less digits than its factorization.

1022721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1612.

The product of its (nonzero) digits is 56, while the sum is 15.

The square root of 1022721 is about 1011.2966923707. The cubic root of 1022721 is about 100.7517019500.

Adding to 1022721 its reverse (1272201), we get a palindrome (2294922).

The spelling of 1022721 in words is "one million, twenty-two thousand, seven hundred twenty-one".