1021408 has 24 divisors (see below), whose sum is σ = 2048760. Its totient is φ = 501120.

The previous prime is 1021403. The next prime is 1021417. The reversal of 1021408 is 8041201.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (16).

It is a junction number, because it is equal to n+sod(n) for n = 1021391 and 1021400.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1021403) 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 in 3 ways as a sum of consecutive naturals, for example, 1618 + ... + 2158.

It is an arithmetic number, because the mean of its divisors is an integer number (85365).

2^1021408 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1021408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1024380).

1021408 is an abundant number, since it is smaller than the sum of its proper divisors (1027352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1021408 is an equidigital number, since it uses as much as digits as its factorization.

1021408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 610 (or 602 counting only the distinct ones).

The product of its (nonzero) digits is 64, while the sum is 16.

The square root of 1021408 is about 1010.6473173170. The cubic root of 1021408 is about 100.7085674632.

Adding to 1021408 its reverse (8041201), we get a palindrome (9062609).

The spelling of 1021408 in words is "one million, twenty-one thousand, four hundred eight".