1217408 has 16 divisors (see below), whose sum is σ = 2425560. Its totient is φ = 608640.

The previous prime is 1217407. The next prime is 1217417. The reversal of 1217408 is 8047121.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1217407) 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 as a sum of consecutive naturals, namely, 4628 + ... + 4883.

2^1217408 is an apocalyptic number.

It is an amenable number.

1217408 is a deficient number, since it is larger than the sum of its proper divisors (1208152).

1217408 is an frugal number, since it uses more digits than its factorization.

1217408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9525 (or 9513 counting only the distinct ones).

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 1217408 is about 1103.3621345687. The cubic root of 1217408 is about 106.7772464351. Note that the first 3 decimals are identical.

The spelling of 1217408 in words is "one million, two hundred seventeen thousand, four hundred eight".