1243843604820 has 48 divisors (see below), whose sum is σ = 3869735661120. Its totient is φ = 331691627808.

The previous prime is 1243843604819. The next prime is 1243843604821. The reversal of 1243843604820 is 284063483421.

It is a happy number.

1243843604820 is a `hidden beast` number, since 1 + 2 + 4 + 38 + 4 + 3 + 604 + 8 + 2 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (1243843604819) and next prime (1243843604821).

It is a super-2 number, since 2×1243843604820² (a number of 25 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1243843604821) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 1151706502 + ... + 1151707581.

It is an arithmetic number, because the mean of its divisors is an integer number (80619492940).

Almost surely, 2^{1243843604820} is an apocalyptic number.

1243843604820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1243843604820 is an abundant number, since it is smaller than the sum of its proper divisors (2625892056300).

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

1243843604820 is a wasteful number, since it uses less digits than its factorization.

1243843604820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2303414101 (or 2303414093 counting only the distinct ones).

The product of its (nonzero) digits is 884736, while the sum is 45.

The spelling of 1243843604820 in words is "one trillion, two hundred forty-three billion, eight hundred forty-three million, six hundred four thousand, eight hundred twenty".