1814721 has 4 divisors (see below), whose sum is σ = 2419632. Its totient is φ = 1209812.

The previous prime is 1814719. The next prime is 1814737. The reversal of 1814721 is 1274181.

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, and also an emirpimes, since its reverse is a distinct semiprime: 1274181 = 3 ⋅424727.

It is a cyclic number.

It is not a de Polignac number, because 1814721 - 2¹ = 1814719 is a prime.

It is a D-number.

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

It is a junction number, because it is equal to n+sod(n) for n = 1814691 and 1814700.

It is not an unprimeable number, because it can be changed into a prime (1814821) 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, 302451 + ... + 302456.

It is an arithmetic number, because the mean of its divisors is an integer number (604908).

2^1814721 is an apocalyptic number.

It is an amenable number.

1814721 is a deficient number, since it is larger than the sum of its proper divisors (604911).

1814721 is an equidigital number, since it uses as much as digits as its factorization.

1814721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604910.

The product of its digits is 448, while the sum is 24.

The square root of 1814721 is about 1347.1158079393. The cubic root of 1814721 is about 121.9747551456.

The spelling of 1814721 in words is "one million, eight hundred fourteen thousand, seven hundred twenty-one".