1021668 has 24 divisors (see below), whose sum is σ = 2509920. Its totient is φ = 322560.

The previous prime is 1021663. The next prime is 1021673. The reversal of 1021668 is 8661201.

It is an interprime number because it is at equal distance from previous prime (1021663) and next prime (1021673).

It is not an unprimeable number, because it can be changed into a prime (1021661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2013 + ... + 2468.

It is an arithmetic number, because the mean of its divisors is an integer number (104580).

2^1021668 is an apocalyptic number.

It is an amenable number.

1021668 is an abundant number, since it is smaller than the sum of its proper divisors (1488252).

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

1021668 is a wasteful number, since it uses less digits than its factorization.

1021668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4507 (or 4505 counting only the distinct ones).

The product of its (nonzero) digits is 576, while the sum is 24.

The square root of 1021668 is about 1010.7759395633. The cubic root of 1021668 is about 100.7171118797.

Adding to 1021668 its reverse (8661201), we get a palindrome (9682869).

It can be divided in two parts, 102 and 1668, that added together give a triangular number (1770 = T₅₉).

The spelling of 1021668 in words is "one million, twenty-one thousand, six hundred sixty-eight".