1144340821 has 8 divisors (see below), whose sum is σ = 1232703584. Its totient is φ = 1056026160.

The previous prime is 1144340801. The next prime is 1144340849. The reversal of 1144340821 is 1280434411.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 1144340821 - 2⁷ = 1144340693 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1144340821.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1144340801) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48826 + ... + 68356.

It is an arithmetic number, because the mean of its divisors is an integer number (154087948).

Almost surely, 2^1144340821 is an apocalyptic number.

1144340821 is the 19531-st octagonal number.

It is an amenable number.

1144340821 is a deficient number, since it is larger than the sum of its proper divisors (88362763).

1144340821 is a wasteful number, since it uses less digits than its factorization.

1144340821 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24051.

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 1144340821 is about 33828.1069674317. The cubic root of 1144340821 is about 1045.9681574953.

The spelling of 1144340821 in words is "one billion, one hundred forty-four million, three hundred forty thousand, eight hundred twenty-one".