1243889628804 has 45 divisors (see below), whose sum is σ = 3251825678101. Its totient is φ = 414623184480.

The previous prime is 1243889628769. The next prime is 1243889628847. The reversal of 1243889628804 is 4088269883421.

The square root of 1243889628804 is 1115298.

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

1243889628804 is a `hidden beast` number, since 12 + 438 + 8 + 96 + 28 + 80 + 4 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1093283542404 + 150606086400 = 1045602^2 + 388080^2 .

It is a super-2 number, since 2×1243889628804² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 14 ways as a sum of consecutive naturals, for example, 20044384 + ... + 20106344.

Almost surely, 2^{1243889628804} is an apocalyptic number.

1243889628804 is the 1115298-th square number.

It is an amenable number.

1243889628804 is an abundant number, since it is smaller than the sum of its proper divisors (2007936049297).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1243889628804 is an frugal number, since it uses more digits than its factorization.

1243889628804 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 123938 (or 61966 counting only the distinct ones).

The product of its (nonzero) digits is 42467328, while the sum is 63.

The spelling of 1243889628804 in words is "one trillion, two hundred forty-three billion, eight hundred eighty-nine million, six hundred twenty-eight thousand, eight hundred four".