1221876 has 18 divisors (see below), whose sum is σ = 3088722. Its totient is φ = 407280.

The previous prime is 1221863. The next prime is 1221907. The reversal of 1221876 is 6781221.

It can be written as a sum of positive squares in only one way, i.e., 1040400 + 181476 = 1020^2 + 426^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 16935 + ... + 17006.

2^1221876 is an apocalyptic number.

It is an amenable number.

1221876 is an abundant number, since it is smaller than the sum of its proper divisors (1866846).

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

1221876 is a wasteful number, since it uses less digits than its factorization.

1221876 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33951 (or 33946 counting only the distinct ones).

The product of its digits is 1344, while the sum is 27.

The square root of 1221876 is about 1105.3850008029. The cubic root of 1221876 is about 106.9077144131.

The spelling of 1221876 in words is "one million, two hundred twenty-one thousand, eight hundred seventy-six".