1221814 has 32 divisors (see below), whose sum is σ = 2188800. Its totient is φ = 505440.

The previous prime is 1221811. The next prime is 1221821. The reversal of 1221814 is 4181221.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (19).

It is a junction number, because it is equal to n+sod(n) for n = 1221791 and 1221800.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1221811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15427 + ... + 15505.

It is an arithmetic number, because the mean of its divisors is an integer number (68400).

2^1221814 is an apocalyptic number.

1221814 is a deficient number, since it is larger than the sum of its proper divisors (966986).

1221814 is a wasteful number, since it uses less digits than its factorization.

1221814 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148.

The product of its digits is 128, while the sum is 19.

The square root of 1221814 is about 1105.3569559197. The cubic root of 1221814 is about 106.9059061581.

It can be divided in two parts, 122 and 1814, that added together give a square (1936 = 44²).

The spelling of 1221814 in words is "one million, two hundred twenty-one thousand, eight hundred fourteen".