1408721 has 4 divisors (see below), whose sum is σ = 1416000. Its totient is φ = 1401444.

The previous prime is 1408709. The next prime is 1408741. The reversal of 1408721 is 1278041.

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 a de Polignac number, because none of the positive numbers 2^k-1408721 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1408741) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3341 + ... + 3738.

It is an arithmetic number, because the mean of its divisors is an integer number (354000).

2^1408721 is an apocalyptic number.

It is an amenable number.

1408721 is a deficient number, since it is larger than the sum of its proper divisors (7279).

1408721 is an equidigital number, since it uses as much as digits as its factorization.

1408721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7278.

The product of its (nonzero) digits is 448, while the sum is 23.

The square root of 1408721 is about 1186.8955303648. The cubic root of 1408721 is about 112.1007013097.

The spelling of 1408721 in words is "one million, four hundred eight thousand, seven hundred twenty-one".