1478221 has 4 divisors (see below), whose sum is σ = 1500352. Its totient is φ = 1456092.

The previous prime is 1478209. The next prime is 1478231. The reversal of 1478221 is 1228741.

1478221 = T₆ + T₇ + ... + T₂₀₆.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1478221 - 2⁵ = 1478189 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1478231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10965 + ... + 11098.

It is an arithmetic number, because the mean of its divisors is an integer number (375088).

2^1478221 is an apocalyptic number.

It is an amenable number.

1478221 is a deficient number, since it is larger than the sum of its proper divisors (22131).

1478221 is an equidigital number, since it uses as much as digits as its factorization.

1478221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22130.

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

The square root of 1478221 is about 1215.8211217116. The cubic root of 1478221 is about 113.9147048446.

The spelling of 1478221 in words is "one million, four hundred seventy-eight thousand, two hundred twenty-one".