43798837781 has 4 divisors (see below), whose sum is σ = 43799263200. Its totient is φ = 43798412364.

The previous prime is 43798837729. The next prime is 43798837783. The reversal of 43798837781 is 18773889734.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 18773889734 = 2 ⋅9386944867.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43798837781 is a prime.

It is a super-2 number, since 2×43798837781² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43798837783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49310 + ... + 300048.

It is an arithmetic number, because the mean of its divisors is an integer number (10949815800).

Almost surely, 2^43798837781 is an apocalyptic number.

It is an amenable number.

43798837781 is a deficient number, since it is larger than the sum of its proper divisors (425419).

43798837781 is a wasteful number, since it uses less digits than its factorization.

43798837781 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 425418.

The product of its digits is 56899584, while the sum is 65.

The spelling of 43798837781 in words is "forty-three billion, seven hundred ninety-eight million, eight hundred thirty-seven thousand, seven hundred eighty-one".