243840415204 has 27 divisors (see below), whose sum is σ = 438631153947. Its totient is φ = 118607289984.

The previous prime is 243840415193. The next prime is 243840415207. The reversal of 243840415204 is 402514048342.

The square root of 243840415204 is 493802.

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

It can be written as a sum of positive squares in 4 ways, for example, as 4719415204 + 239121000000 = 68698^2 + 489000^2 .

It is a super-2 number, since 2×243840415204² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (37).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (243840415207) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 36538012 + ... + 36544684.

Almost surely, 2^243840415204 is an apocalyptic number.

243840415204 is the 493802-nd square number.

It is an amenable number.

243840415204 is a deficient number, since it is larger than the sum of its proper divisors (194790738743).

243840415204 is an frugal number, since it uses more digits than its factorization.

243840415204 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13424 (or 6712 counting only the distinct ones).

The product of its (nonzero) digits is 122880, while the sum is 37.

The spelling of 243840415204 in words is "two hundred forty-three billion, eight hundred forty million, four hundred fifteen thousand, two hundred four".