1221704 has 16 divisors (see below), whose sum is σ = 2499120. Its totient is φ = 555280.

The previous prime is 1221667. The next prime is 1221707. The reversal of 1221704 is 4071221.

1221704 = T₃₀₇ + T₃₀₈ + ... + T₃₃₀.

It is not an unprimeable number, because it can be changed into a prime (1221707) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6854 + ... + 7029.

It is an arithmetic number, because the mean of its divisors is an integer number (156195).

2^1221704 is an apocalyptic number.

It is an amenable number.

1221704 is an abundant number, since it is smaller than the sum of its proper divisors (1277416).

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

1221704 is a wasteful number, since it uses less digits than its factorization.

1221704 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13900 (or 13896 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 17.

The square root of 1221704 is about 1105.3071971176. The cubic root of 1221704 is about 106.9026978130.

Adding to 1221704 its reverse (4071221), we get a palindrome (5292925).

The spelling of 1221704 in words is "one million, two hundred twenty-one thousand, seven hundred four".