1344843721 has 4 divisors (see below), whose sum is σ = 1448293252. Its totient is φ = 1241394192.

The previous prime is 1344843719. The next prime is 1344843743. The reversal of 1344843721 is 1273484431.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 1273484431 = 43 ⋅29615917.

It can be written as a sum of positive squares in 2 ways, for example, as 425844496 + 918999225 = 20636^2 + 30315^2 .

It is a cyclic number.

It is not a de Polignac number, because 1344843721 - 2¹ = 1344843719 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1344843121) 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, 51724746 + ... + 51724771.

It is an arithmetic number, because the mean of its divisors is an integer number (362073313).

Almost surely, 2^1344843721 is an apocalyptic number.

It is an amenable number.

1344843721 is a deficient number, since it is larger than the sum of its proper divisors (103449531).

1344843721 is a wasteful number, since it uses less digits than its factorization.

1344843721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 103449530.

The product of its digits is 64512, while the sum is 37.

The square root of 1344843721 is about 36672.1109427859. The cubic root of 1344843721 is about 1103.8005510421.

The spelling of 1344843721 in words is "one billion, three hundred forty-four million, eight hundred forty-three thousand, seven hundred twenty-one".