1217828 has 6 divisors (see below), whose sum is σ = 2131206. Its totient is φ = 608912.

The previous prime is 1217813. The next prime is 1217831. The reversal of 1217828 is 8287121.

It can be written as a sum of positive squares in only one way, i.e., 1149184 + 68644 = 1072^2 + 262^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 1217828.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 152225 + ... + 152232.

It is an arithmetic number, because the mean of its divisors is an integer number (355201).

2^1217828 is an apocalyptic number.

It is an amenable number.

1217828 is a deficient number, since it is larger than the sum of its proper divisors (913378).

1217828 is a wasteful number, since it uses less digits than its factorization.

1217828 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 304461 (or 304459 counting only the distinct ones).

The product of its digits is 1792, while the sum is 29.

The square root of 1217828 is about 1103.5524455140. The cubic root of 1217828 is about 106.7895242382.

The spelling of 1217828 in words is "one million, two hundred seventeen thousand, eight hundred twenty-eight".