1216604 has 6 divisors (see below), whose sum is σ = 2129064. Its totient is φ = 608300.

The previous prime is 1216603. The next prime is 1216619. The reversal of 1216604 is 4066121.

It is a happy number.

It is a plaindrome in base 13.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1216601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152072 + ... + 152079.

It is an arithmetic number, because the mean of its divisors is an integer number (354844).

2^1216604 is an apocalyptic number.

It is an amenable number.

1216604 is a deficient number, since it is larger than the sum of its proper divisors (912460).

1216604 is a wasteful number, since it uses less digits than its factorization.

1216604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304155 (or 304153 counting only the distinct ones).

The product of its (nonzero) digits is 288, while the sum is 20.

The square root of 1216604 is about 1102.9977334519. The cubic root of 1216604 is about 106.7537353328.

The spelling of 1216604 in words is "one million, two hundred sixteen thousand, six hundred four".