1424721 has 4 divisors (see below), whose sum is σ = 1899632. Its totient is φ = 949812.

The previous prime is 1424707. The next prime is 1424723. The reversal of 1424721 is 1274241.

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 de Polignac number, because none of the positive numbers 2^k-1424721 is a prime.

It is a D-number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1424723) 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, 237451 + ... + 237456.

It is an arithmetic number, because the mean of its divisors is an integer number (474908).

2^1424721 is an apocalyptic number.

It is an amenable number.

1424721 is a deficient number, since it is larger than the sum of its proper divisors (474911).

1424721 is an equidigital number, since it uses as much as digits as its factorization.

1424721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 474910.

The product of its digits is 448, while the sum is 21.

The square root of 1424721 is about 1193.6167726704. The cubic root of 1424721 is about 112.5235111355.

Adding to 1424721 its reverse (1274241), we get a palindrome (2698962).

It can be divided in two parts, 1424 and 721, that added together give a triangular number (2145 = T₆₅).

The spelling of 1424721 in words is "one million, four hundred twenty-four thousand, seven hundred twenty-one".