1803855827929 has 15 divisors (see below), whose sum is σ = 1869449759787. Its totient is φ = 1740563324304.

The previous prime is 1803855827927. The next prime is 1803855827953. The reversal of 1803855827929 is 9297285583081.

The square root of 1803855827929 is 1343077.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in 7 ways, for example, as 1369379742025 + 434476085904 = 1170205^2 + 659148^2 .

It is not a de Polignac number, because 1803855827929 - 2¹ = 1803855827927 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1803855827927) by changing a digit.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 1129526959 + ... + 1129528555.

Almost surely, 2^{1803855827929} is an apocalyptic number.

1803855827929 is the 1343077-th square number.

1803855827929 is the 671539-th centered octagonal number.

It is an amenable number.

1803855827929 is a deficient number, since it is larger than the sum of its proper divisors (65593931858).

1803855827929 is an frugal number, since it uses more digits than its factorization.

1803855827929 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3310 (or 1626 counting only the distinct ones).

The product of its (nonzero) digits is 87091200, while the sum is 67.

The spelling of 1803855827929 in words is "one trillion, eight hundred three billion, eight hundred fifty-five million, eight hundred twenty-seven thousand, nine hundred twenty-nine".