1221478 has 4 divisors (see below), whose sum is σ = 1832220. Its totient is φ = 610738.

The previous prime is 1221469. The next prime is 1221499. The reversal of 1221478 is 8741221.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8741221 = 2441 ⋅3581.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 305368 + ... + 305371.

It is an arithmetic number, because the mean of its divisors is an integer number (458055).

2^1221478 is an apocalyptic number.

1221478 is a deficient number, since it is larger than the sum of its proper divisors (610742).

1221478 is an equidigital number, since it uses as much as digits as its factorization.

1221478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 610741.

The product of its digits is 896, while the sum is 25.

The square root of 1221478 is about 1105.2049583675. The cubic root of 1221478 is about 106.8961055180.

Adding to 1221478 its reverse (8741221), we get a palindrome (9962699).

It can be divided in two parts, 122 and 1478, that added together give a square (1600 = 40²).

The spelling of 1221478 in words is "one million, two hundred twenty-one thousand, four hundred seventy-eight".