1221868 has 12 divisors (see below), whose sum is σ = 2148552. Its totient is φ = 608000.

The previous prime is 1221863. The next prime is 1221907. The reversal of 1221868 is 8681221.

It is a super-2 number, since 2×1221868² = 2985922818848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1221863) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 396 + ... + 1612.

It is an arithmetic number, because the mean of its divisors is an integer number (179046).

2^1221868 is an apocalyptic number.

It is an amenable number.

1221868 is a deficient number, since it is larger than the sum of its proper divisors (926684).

1221868 is a wasteful number, since it uses less digits than its factorization.

1221868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1472 (or 1470 counting only the distinct ones).

The product of its digits is 1536, while the sum is 28.

The square root of 1221868 is about 1105.3813821483. The cubic root of 1221868 is about 106.9074810933.

The spelling of 1221868 in words is "one million, two hundred twenty-one thousand, eight hundred sixty-eight".