43420739987 has 4 divisors (see below), whose sum is σ = 43908613560. Its totient is φ = 42932866416.

The previous prime is 43420739963. The next prime is 43420740019. The reversal of 43420739987 is 78993702434.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-43420739987 is a prime.

It is a super-2 number, since 2×43420739987² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43420739287) 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, 243936653 + ... + 243936830.

It is an arithmetic number, because the mean of its divisors is an integer number (10977153390).

Almost surely, 2^43420739987 is an apocalyptic number.

43420739987 is a deficient number, since it is larger than the sum of its proper divisors (487873573).

43420739987 is an equidigital number, since it uses as much as digits as its factorization.

43420739987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 487873572.

The product of its (nonzero) digits is 9144576, while the sum is 56.

The spelling of 43420739987 in words is "forty-three billion, four hundred twenty million, seven hundred thirty-nine thousand, nine hundred eighty-seven".