243920417690 has 16 divisors (see below), whose sum is σ = 439064708328. Its totient is φ = 97566398976.

The previous prime is 243920417681. The next prime is 243920417693. The reversal of 243920417690 is 96714029342.

243920417690 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 493883²+1.

It can be written as a sum of positive squares in 4 ways, for example, as 132882849961 + 111037567729 = 364531^2 + 333223^2 .

It is a super-2 number, since 2×243920417690² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (243920417693) 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 7 ways as a sum of consecutive naturals, for example, 457634 + ... + 835026.

Almost surely, 2^243920417690 is an apocalyptic number.

243920417690 is a deficient number, since it is larger than the sum of its proper divisors (195144290638).

243920417690 is a wasteful number, since it uses less digits than its factorization.

243920417690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 442033.

The product of its (nonzero) digits is 653184, while the sum is 47.

The spelling of 243920417690 in words is "two hundred forty-three billion, nine hundred twenty million, four hundred seventeen thousand, six hundred ninety".