1799228621 has 4 divisors (see below), whose sum is σ = 1800708252. Its totient is φ = 1797748992.

The previous prime is 1799228597. The next prime is 1799228633. The reversal of 1799228621 is 1268229971.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 359860900 + 1439367721 = 18970^2 + 37939^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-1799228621 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1799228021) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 737990 + ... + 740423.

It is an arithmetic number, because the mean of its divisors is an integer number (450177063).

Almost surely, 2^1799228621 is an apocalyptic number.

It is an amenable number.

1799228621 is a deficient number, since it is larger than the sum of its proper divisors (1479631).

1799228621 is a wasteful number, since it uses less digits than its factorization.

1799228621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1479630.

The product of its digits is 217728, while the sum is 47.

The square root of 1799228621 is about 42417.3151083375. The cubic root of 1799228621 is about 1216.2666082536.

The spelling of 1799228621 in words is "one billion, seven hundred ninety-nine million, two hundred twenty-eight thousand, six hundred twenty-one".