1021604 has 12 divisors (see below), whose sum is σ = 1806924. Its totient is φ = 505344.

The previous prime is 1021577. The next prime is 1021621. The reversal of 1021604 is 4061201.

It can be written as a sum of positive squares in 2 ways, for example, as 302500 + 719104 = 550^2 + 848^2 .

It is a plaindrome in base 13.

It is an unprimeable number.

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, 929 + ... + 1704.

It is an arithmetic number, because the mean of its divisors is an integer number (150577).

2^1021604 is an apocalyptic number.

It is an amenable number.

1021604 is a deficient number, since it is larger than the sum of its proper divisors (785320).

1021604 is a wasteful number, since it uses less digits than its factorization.

1021604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2734 (or 2732 counting only the distinct ones).

The product of its (nonzero) digits is 48, while the sum is 14.

The square root of 1021604 is about 1010.7442802213. The cubic root of 1021604 is about 100.7150087732.

Adding to 1021604 its reverse (4061201), we get a palindrome (5082805).

The spelling of 1021604 in words is "one million, twenty-one thousand, six hundred four".