43721243 has 4 divisors (see below), whose sum is σ = 43882848. Its totient is φ = 43559640.

The previous prime is 43721189. The next prime is 43721257. The reversal of 43721243 is 34212734.

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

It is a cyclic number.

It is not a de Polignac number, because 43721243 - 2¹⁰ = 43720219 is a prime.

It is a super-3 number, since 3×43721243³ (a number of 24 digits) contains 333 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (43721273) 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, 80396 + ... + 80937.

It is an arithmetic number, because the mean of its divisors is an integer number (10970712).

Almost surely, 2^43721243 is an apocalyptic number.

43721243 is a deficient number, since it is larger than the sum of its proper divisors (161605).

43721243 is a wasteful number, since it uses less digits than its factorization.

43721243 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161604.

The product of its digits is 4032, while the sum is 26.

The square root of 43721243 is about 6612.2040954586. The cubic root of 43721243 is about 352.2877161885.

Adding to 43721243 its reverse (34212734), we get a palindrome (77933977).

The spelling of 43721243 in words is "forty-three million, seven hundred twenty-one thousand, two hundred forty-three".