1409721 has 4 divisors (see below), whose sum is σ = 1879632. Its totient is φ = 939812.

The previous prime is 1409717. The next prime is 1409731. The reversal of 1409721 is 1279041.

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 1409721 - 2² = 1409717 is a prime.

It is an Ulam number.

It is a D-number.

1409721 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 1409691 and 1409700.

It is not an unprimeable number, because it can be changed into a prime (1409731) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 234951 + ... + 234956.

It is an arithmetic number, because the mean of its divisors is an integer number (469908).

2^1409721 is an apocalyptic number.

It is an amenable number.

1409721 is a deficient number, since it is larger than the sum of its proper divisors (469911).

1409721 is an equidigital number, since it uses as much as digits as its factorization.

1409721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 469910.

The product of its (nonzero) digits is 504, while the sum is 24.

The square root of 1409721 is about 1187.3167226987. The cubic root of 1409721 is about 112.1272204445.

The spelling of 1409721 in words is "one million, four hundred nine thousand, seven hundred twenty-one".