43718393939 has 4 divisors (see below), whose sum is σ = 47692793400. Its totient is φ = 39743994480.

The previous prime is 43718393933. The next prime is 43718393941. The reversal of 43718393939 is 93939381734.

It is a happy number.

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-43718393939 is a prime.

It is a super-2 number, since 2×43718393939² (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 (43718393933) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1987199714 + ... + 1987199735.

It is an arithmetic number, because the mean of its divisors is an integer number (11923198350).

Almost surely, 2^43718393939 is an apocalyptic number.

43718393939 is a deficient number, since it is larger than the sum of its proper divisors (3974399461).

43718393939 is a wasteful number, since it uses less digits than its factorization.

43718393939 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3974399460.

The product of its digits is 13226976, while the sum is 59.

The spelling of 43718393939 in words is "forty-three billion, seven hundred eighteen million, three hundred ninety-three thousand, nine hundred thirty-nine".