43798409991 has 20 divisors (see below), whose sum is σ = 74774006032. Its totient is φ = 25027662528.

The previous prime is 43798409989. The next prime is 43798409999. The reversal of 43798409991 is 19990489734.

It is not a de Polignac number, because 43798409991 - 2¹ = 43798409989 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (43798409999) 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 19 ways as a sum of consecutive naturals, for example, 38622370 + ... + 38623503.

Almost surely, 2^43798409991 is an apocalyptic number.

43798409991 is a deficient number, since it is larger than the sum of its proper divisors (30975596041).

43798409991 is an equidigital number, since it uses as much as digits as its factorization.

43798409991 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 77245892 (or 77245883 counting only the distinct ones).

The product of its (nonzero) digits is 17635968, while the sum is 63.

The spelling of 43798409991 in words is "forty-three billion, seven hundred ninety-eight million, four hundred nine thousand, nine hundred ninety-one".