1478721 has 8 divisors (see below), whose sum is σ = 1978560. Its totient is φ = 982352.

The previous prime is 1478707. The next prime is 1478723. The reversal of 1478721 is 1278741.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1478721 - 2⁵ = 1478689 is a prime.

It is an alternating number because its digits alternate between odd and even.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (1478723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 391 + ... + 1763.

It is an arithmetic number, because the mean of its divisors is an integer number (247320).

2^1478721 is an apocalyptic number.

It is an amenable number.

1478721 is a deficient number, since it is larger than the sum of its proper divisors (499839).

1478721 is a wasteful number, since it uses less digits than its factorization.

1478721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1735.

The product of its digits is 3136, while the sum is 30.

The square root of 1478721 is about 1216.0267266800. The cubic root of 1478721 is about 113.9275470677.

The spelling of 1478721 in words is "one million, four hundred seventy-eight thousand, seven hundred twenty-one".